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CER: ain wacutt. eft 2 Operation Parts Listé! # > OsPa.die: eeeunenin, . grostiles.0. Hig 2 of the SE a a small — 3s | HHRATEHEIT” fet MOUNTING peers a nes ce taece tse ee ee 6 —— 3 IFINGHehy., ory Ne, Fe eee ahd. Oe 11 Cable"Preparationitn? .O 8. Re) Gms fe 18 TRANSISTORIZED IMALIALRLCStS ep ey ee caer oe She cad Wl bec abate ee 20 DC POWER SUPPLY Final, Assemblva eee. 2h PN. goeee. Fir 21 MODEL HP-13B installatiOnitramgm shu. Moris co cere tse hematite 5 les 22 In'Case of Difficlltyae et Heath teres, Serre Seite. oe 24 Saree lo 6G og oo 6 Do Go oe coe e + 27 Chreuie beanie o bo 4 0 6 OM oO AG oO Oe r > of [as Ghassistehotoghaphienm mre mt ti sa cine tout tecnii sc 30 ERAN ICWY Raa e as a ere oes direc eae sce MMs eae ip 31 Schematic. ..(fold-out from page) .......-+.--: 31 Warran tyme ns Be cet hoe of ites ours Inside front cover Customer Service .....-...-- Inside rear cover HEATH COMPANY BENTON HARBOR, MICHIGAN 49022 Se is ae : 1 OF wa : ' r , aN VRAD 5 ee earl Ra ar ne bi , ve o - -? >. a ‘ STE TUS 40 2 eT i ~ ey eee : vide ‘ae tei onal Varete , ee ee roe bee, es ia : piiiteuan ¢ i f "ea * @ gt Aaya aR er aes §. —_~-_ { hrs : po h ats mead tagay’® ahead GaSinoTet 2 YISAUS v4 ‘sera ae} ice 7, oe Ghee ene f igarbei er ee Yo Wie eA caters? T ' " : era THY Focus ait i 7 ‘ oe vee: Sd ae ! os u iy Gh a Trays 7 . Rerinorant” argast » q ~ ‘ ¥ We , 7 J f aay at ~ “| be, , (gag mor Me Se), oie ae iY ohsieer { FF : = | ' * i ? vetted q a : Ky ? ) y 7 iy ) ¥ ae ' a i 1 ee ae ’ ) % » x ig f stcar: f ; fe » My ' ay Pe 4 KEY PART PARTS DESCRIPTION PRICE _No. No. Per Kit Each RESISTORS Al 1-3-1 1 3300 22 (orange-orange- 10 red), 1-watt Al 1-46-1 1 27 kQ (red-violet-orange), 10 1-watt A2 1-15-2 1 1000 {2 (brown-black-red), 15 2-watt A2 1-24-2 3 100 kQ (brown-black- 15 yellow), 2-watt A3 3-1-24 2 4 2, 24-watt, ceramic .95 Page 2 : [ager arsrry INTRODUCTION The Heathkit Model HP-13B Transistorized DC Power Supply was designed to furnish all necessary operating power for Heathkit Mobile Amateur Transmitters, Transceivers, and Receivers, as well as for other brands of mobile equipment. This Power Supply is actually three DC power sources in one unit. It provides high voltage (750 volts), tow voltage (300 or 250 volts), and bias voltage (—130 volts). It also switches DC filament voltage for the equipment with which it is used. Circuit features include relay control of all primary power, plus individual circuit breaker protection of the DC input to the Power Supply and of the DC filament voltage line to the equipment used with the Power Supply. The circuit breakers are the automatic reset, load delay type. They insure positive protection for all equipment involved in case of an overload or accidental short circuit, The power transformer, an epoxy encapsulated toroid unit is of advanced design, assuring maximum efficiency. This transformer, in conjunction with the power transistors used as a DC-to-AC converter, provides a high frequency switching rate along with high power and instant starting. Specially designed heat sink assemblies provide maximum transistor cooling. Efficient, long life silicon rectifiers and heavy-duty filter capacitors, mounted on a rugged circuit board, provide trouble-free rectification and filtering. Because the complete Power Supply is physically small, it requires a minimum of mounting space. Under-the-hood mounting is recommended. Read the “Kit Builders Guide” for complete information on unpacking, parts identification, tools, wiring, soldering, and step-by-step assembly procedures. PARTS LIST Check each part against the following list. The key numbers correspond to numbers on the Parts Pictorial (fold-out from Page 3). To order replacement parts use the Parts Order Form furnished with this kit. If a Parts Order Form is not available, refer to the “’Parts Replacement” inside the rear cover of the Manual. Any part that is packaged in an individual envelope with a part number on it should be placed back in its envelope after it is identified, until that part is called for in a step. KEY PART PARTS DESCRIPTION PRICE No. No. Per Kit Each CAPACITORS B1 21-35 3 .005 uF 1.6 kV disc 15 B2 25-254 2 4 uF electrolytic 50 B3 25-206 1 20-20 uF electrolytic 85 B4 25-207 5 20 uF electrolytic 85 B4 25-28 fq 100 uF electrolytic .60 B5 27-20 1 4 uF Mylar* 30 *DuPont Registered Trademark itty Biot: ant ; iar q .bieod Swoon beogwys nO berniee aericngas priest? bee ncitgahitnn asf -aiduens W ylnokyrg 2 viequé wud smplyetigd sf esane® on} soege. goliswom TO milly & revaner- ) .ehsertinessy 8 aie , i. Te ~ iW ly Tir @pelarciae Volk alse) sethie 1A" Gt tees ‘ veolta ptivew ghood vole rm ori, Jeririnohy 2e2OVA rey Cg gee 3 oh reeamenaiieh etme dade oy usher pron aor | - = ; mare wht hi Hotel jtrhw scolaune loubiyjori ne mi bepsioca y > Dw VGA: fle sg0tsuee en oi ond, bevaly ge yi varie 9 WY SUN F468 rate 9 vl Yt belles idee Terr fitny beltit newb a 7 < i TAReAIG. zrAad TAM YS 5 ute | Lo - ee = eae totter) 7 ' (7 y MOITOUGOATML | weal 9a hesivoniénanT array peo & vewng yieming fe Fo. towns yale? sbulsni eowusrest hi " @rty oF ort?! egetioy sreemalit OO sd fo bas Vigqua gO Mer tums TH. LeTAAT viadeaayrs vk es? nit baie Met ew renege Fiat i ORO! WAND 2ts8 ‘ate ay ere. Inemeaetast i to. : - - y a © 5 Owns os ei ‘ A a 4 i] " c Phas roan ty — 7 4 — Qrithnago vreseoaar ‘te rheirit oF berg sep wetiinenesT * averarndA Witter fe: isonet io ton io rm ars (G egotute wewoG DT ees Witaaaton af COO) eqettoy wot (@lov ORT}: suriosiws cets 3! . toy GET < bajaiafianiion % ON betes af 11 hole eget of 08 apatlow se a) van IG art to Noirsetorg vexeerd yutis tub! any .vidaue wwe aris ittw bequ tr evan yotT aseyt yelob tal seein sifemoyiue, ot 5 1% ho 4en9 w bevioved Jomeogiupe lis 1c? roloeroiq tivero Juorle Jeinebesos wo De a mont ) wore) aeivory as wt wi to. eaiiun. ane Bay aj mon ‘tabi we? «a a at Asis ' i 25189 VOITUADEIO * hades —cinen : . rea ntaiemnctiateapoatet da ; 5 @yIBIO-9pn ew) OD QOEE™ travel (bar Aatairioivbeh RASS sz Stew f- | Alfie dadigenwond) 2 900¢- tai “eetitweond) O24 001 i is. : \ om & es o ee Bs 51, ‘ee > ri a 7 : 7 » ‘ 5! _ ia Pe 5; , ) os ee ae = ©. ? ’ eae a a af - : ya ay i Mj ‘Ls ‘y \ v ts é S a fF . a o LS Fj Lc Vtg) shop , aa - a! © iy = GegurarHrire KEY PART PARTS DESCRIPTION No. No. Per Kit CIRCUIT BREAKERS-RELAY-CHOKES- TRANSFORMER C1 65-20 1 10-ampere circuit breaker C1 65-16 1 40-ampere circuit breaker C2 69-68 1 12-volt relay C3 45-59 1 Suppression choke C4 46-24 1 Filter choke C5 54-144 1 Power transformer DIODES-TRANSISTORS D1 57-27 7 Silicon diode, 600V, 1A (1N2071) Di® 57-42 1 Silicon diode, 100V, 3A (3A1) D2 417-120 2 Power transistor FUSEHOLDER-PLUG-CABLE CONNECTOR E1 423-10 1 In-line fuseholder E2 432-34 1 15-contact plug E3 » 432-35 1 15-contact connector METAL PARTS F1 200-633-1 1 Chassis F2 204-549 1 Circuit breaker mounting bracket F3 205-417-1 1 Bottom plate F4 215-11-1 2 Heat sink (bottom section) F5 215-12-1 22 Heat sink (middle section) F6 215-13-1 4 Heat sink (top section) HARDWARE #6 Hardware G1 250-235 8 6-32 x 1/4” screw G2 250-233 12 6-32 x 3/8” screw G3 250-234 10 6-32 x 1/2” screw G4 © 250-364 2 6-32 x 7/8" screw G5 250-237 4 #6 x 3/8” sheet metal screw G6r 252-77 24 6-32 nut G7 253-96 2 #6 flat washer G8 254-25 26 #6 lockwasher G9 259-1 4 #6 solder lug G10 255-23 4 #6 threaded spacer KEY PART No. #10 Hardware G11 G12 G13 G14 G15 G16 No. 250-83 252-63 253-3 253-7 254-36 259-5 PARTS Per Kit Bey MISCELLANEOUS 85-78-2 259-15 259-20 262-8 259-21 260-32 344-2 346-2 347-13 347-52 421-13 490-5 391-34 597-260 597-308 ee ee ee ee ee Yl Page 3 DESCRIPTION #10 x 1/2” sheet metal screw 10-32 nut #10 fiber flat washer #10 fiber shoulder washer #10 lockwasher #10 solder lug Circuit board Hook type solder lug Circuit board solder terminal Circuit board solder pin 5/16" solder lug Cable connector clip lock Black wire Large sleeving 2-wire cable 8-wire cable 1/2-ampere fuse Nut starter Blue and white identification label Parts Order Form Kit Builders Guide Manual (See front cover for part number.) Solder (Additional 3’ rolls of solder, #331-6, can be ordered for 15 cents each.) ‘ PRICE Each .05 .05 .05 .05 10 .05 _ .80 ,05 .05 .05 .05 30 .05/ft .05/ft .15/ft .60/ft 15 sie) 2.00 | The above prices apply only on purchases from the Heath Company where shipment is to a U.S.A. destination. Add 10% (minimum 25 cents) to the price when ordering from a Heathkit Electronic Center to cover local sales tax, postage, and handling. Outside the U.S.A. parts and service are available from your local Heathkit source and will reflect taxes, duties, and rates of additional exchange. transportation, veal, «ef eolne Wael TeNON OF emg D gheuceRAy viitnea ee med ; be ee oI . = FAY “MOITMHes0 aTAAg-” TRAY YRA fond soe (Ey =e ma ae - qmvtnali ore 7 an ‘latorn roerle * VP x OM b tales 12 woo : n Woes a ma SOOr 8 cere ssrA ; verksew tell red Ore . SLR. Cd. a webivera welt OFS & [eas ord ‘par - ; : : } wrlgawtdol 01% t BO-Par 8°D pul woloe OF 26By @ib 2UO0SVAA1F93IM : wod tiv ds 1 CAN 38 x bioe eave yor f as as re gu a vehice treod tiuatiD ieee 6H lanl rte? ay aioe brsod Huai tae EM isi r oul wabice “S\2 oP | ees ae Gila yefoeAives sided .- : Seee Bh i. el i aie . Siw Saia CONDE orthessie sig yet. Hee ¢ dacs etw-S cre c vices odweh ‘Be St) t Svante vi! H EP-i ge Y _ Terada uv ; SOG “gtiche Soe aula : ke OT: ” Jecet natealiretl. . one 4 Me eee. Sen tea abinD ewbiues AA. Ff Ae TPR ' veo Toy? qe) teeng (.edenur Pag KP | nee , Elena GhA-wbled _- 2( Coe vehlae To atk a! ior booed atl cies. (foes ether ' re % a vs diae ony nent ‘eniitenel nylon vinae swale wore oT bik nottsnime ACL sof a ineminitte sqedey yreumek). 6 rot? pn! eb ered si beran AP Hetirinn BS mivmiiniond 201 bth setup Dy aaa’ AED locke: aint tyr ltacunnd erected Bris Liens hui te seagruge talieal tes wm Mont eicaliews 10 aese| baw nina” tis nONoeN Inert - be ey at, _ ttivote stan snk me ar. nor) die tue 7 : ; | diettoes | ; ; e Y f bas +e. F “a Ds cr a od ony Tyr? 7) * ar yoiend uecenaaee . iz - weteard tania pregeraiOR ; . yolet flow aT {* . sor nolan - antorto ser emvotanert went ~— —_ ~~ =~ 2nOT V0G0 chats coca ets GESOSIREP AR rt i WOOT ebelb neaine =¢ ihe (PAE AL eT ae a> _ = nee WAOD 9.142 BUIGARE " wbipriseut enitnt - ff 2 geleptastacs3t % | teteinaa rparnoe St. a TeAzeid © ~, Wetted! Anikgact”’. 5). m y inoitase w ‘dniemeH ~ (wolrses iy ~ s eaten xtes rah & Ge QHEearHrire ( “Blue lead to the circuit board pin marked BLUE (S-1). (7 6" gray lead to the circuit board pin marked BIAS (S-2). ( Cr Gres vellow lead to lug 2 of transistor AE (S-1). ( a Oh Green lead to lug 1 of resistor AH (S-2). Wrap this lead around the resistor lug. ("J Carefully inspect the lugs of the resistors at CB and AH. Make sure the lugs do not touch the screws at CC and AG respectively. IMPORTANT: The low voltage output circuit has two voltage values available. The low tap output is 250 volts DC. The high tap output is 300 volts DC. Determine which of these voltages is required for the equipment with which you plan to use the Power Supply. Then proceed to the steps for the voltage value you have selected. Terminal D on the circuit board is a “dummy” terminal. (Make sure the leads are soldered to the terminals and that the terminals are soldered to the circuit board.) BLU-GRN BLU-YEL -D ca TI ae 2 ee oy 8 8 BLUE/YELLOW LOW TAP > & Mia ara, Detal9A —) Page 17 For 250-Volt DC Output Refer to Detail 9A for the following steps. ( Blue-yellow lead to the solder terminal marked BLUE/YELLOW LOW TAP (S-1). (Blue-green lead to the solder terminal marked D (S-1). Proceed to ‘’Cable Preparation.” aa @ foe BLU-GRN D + B@ > 883 BLUE/GRN HIGH TAP sae Detail 9B For 300-Volt DC Output - | 8 &£ Refer to Detail 9B for the following steps. Blue-green lead to the solder terminal marked BLUE/GRN HIGH TAP (S-1). ie) Blue-yellow lead to the solder terminal marked D (S-1). ~~ ~~ Proceed to ‘‘Cable Preparation.” —_ a if Ct eget + 7S ANT ae re Leys nqiw0 90 sloV-088 a be aui18 basta a a aqure gre Bit 308 (ie ligne on whe — 2A18 posta mig bread le adr oF beste tacinner wabios elt ot . best 0 cuneate M-2P UAT WOs WOLVES & ina hci abel a . (1-2) G bostinrn ienintaa wbles erttor best epaipat dt) ‘ beet 1 es aN 48-2) WAseiee te f puter bal a . pc? eae : oe: gud otelgey orte t qoitewsqetl stds)’ af Seagent - zl rie nT —— anaemia ee 8) te eal! tie te a ne oegaayn Cae rene... 90) 28 atwende ort faut Fon i eu ertt ou ms ; a ar er ; 7 ; ea eaaiiatih ae Wis oad) =a?) tj . I how oat : x ae SD er” Se wg] OMe tert jiueaia tugtva a Wot ke B z 4 Ur . 7 Geet . 20 etlov GSS ef ruqruc qar wol et? .sidelinve See) teed ie 1% | “Ye detitreniihereG 30 wlov 00S abtuntvo ¢ : \ ow) & Se Ky Hoy doktw thw Inarnaiups ert 10% bariipen af one ———— ere, = so) ayeta art OF Baesorg pecit “elgg? iewod sith i ie) oct no Q letiviaT betselee avai voy suley tr ln Sa goal orb trust RDA) lenin “yond” 6 aif i | ra “~ ss : ove ancien wt ial zarty bas, ztenjener ertt off fo "Gros nse wo PA i } ‘ , i j a ‘ i; y Ww) if 2 : ; J Y ' t i] : \ yy ,4 \ i 9 ek pet (rat. ug Me (fs a | a — fs 4 P ~ off] ~“ ry) f vif BY _~ far » Ohites 7 1 ee? ; ~~ : \* . Oar. Ge ves ihe eee a KE : ' yaa- C—O \ a tes f 7 rs atmmnenran am ie a... | pepectemeainte reer srestrmnns or a ba, BI we” } a gl 0 0 i ate "acid grb? wtp not se fern 03 die besten tanierril tie: 98 08 boots nner 4. tf Ts alueiibinaidiatnentellt 7 re Page 20 GegumsrHxire INITIAL TESTS ey Yo avoid possible damage, it is important that you use an ohmmeter to make the following resistance checks before you connect or turn on the Power Supply. If you cannot obtain the proper ohmmeter indication in the following steps, refer to the ‘In Case of Difficulty” section. DO NOT turn on the Power Supply until the difficulty has been corrected. NOTE: Use a vaccum tube voltmeter (VTVM) or a volt-ohmmeter (VOM) to make the resistance check in the following steps (solid-state ohmmeters do not furnish a voltage high enough to make the diodes conduct in the circuit being tested). Make sure you have the ohmmeter set correctly, since the range setting influences the meter reading when a diode is in the circuit. ( ) Set the ohmmeter to the RX1 range. Because some of the circuits to be measured contain diodes, you will obtain different resistance readings if the polarity of the meter leads is reversed in the following measurements. Therefore, in the next two steps you will determine the polarity of the ohmmeter test leads and connect the proper lead to chassis ground. IS ciyp LOCK PICTORIAL 13 Refer to Pictorial 13 for the following steps. (_) Make sure the clip locks do not touch any lugs of connector BA. If necessary, bend the clip locks back slightly. ( ) Connect the negative meter lead to the banded end of diode D2. Connect the positive meter lead to the other diode lead. If the resistance is approximately 10 ohms, connect the negative meter lead to the chassis (ground) for the following resistance checks and disregard the next step. ( ) If the meter needle remains on or near the infinity mark (full scale), reverse the meter leads. If you now obtain a reading of approximately 10 ohms, connect the positive meter lead to the chassis (ground) for the following resistance checks. Make the resistance checks in the following chart from chassis ground to the indicated points. Some of the readings will take a few seconds to reach the specified resistance because of the slow charging rate of the capacitor in the Power Supply. a — prproaets< er ee veteat Ef JAIROTOH aera anivaaliet erif yor Ef % sori? ay sobott $ pul yas dower so8 BS also! alt of sue unt’ 3 pony 5 edt “br aneesicen AG tardtin nee ivitagit: o bow bebred art of tren! eR oiyaon atten) ( 1 vectra est? oF bask Torssn wvitinsg ert thunne SO etal éralo OT yisterrdRovgne a SortsrEige ey 1 .baal dtrdib © amor. oft oF Dag “tem weisten wi) tsenwoo 7 prs iicotty sonar ghiwelot arf wi ‘(bina _ lai tana 908 eggerseilo wiiakal ert ves to po anieent gipeen wipe ew 1 wot) voy Vi abeet wesod eit seman {teleow Wat) - sane foannan site C! yiareesixenges fo quiben. ra rinse, . at =i ren cieentlp amt Be basi wien evisisens orth : izico sonentens gutiycitat mor! starts _pniweottot tit i” eae one: wt watt pec arioraet — egniaeny orl lo emoe wntog ont oF * qemvaniies beltisnge jet Romy at : ert +i yorlonqno ert, < ae bar moe te es re =? a i as moe AAT _ Fae wey tary starve eaieat sien Broted whado sansteinn griwollot gl! ota, OF -m Bong voy YY .vianGe ww slo mut 10 ToRnm geiwottet ert oi noiegion! wegecninin wow bal TOW OG. noitsn: ‘ytiuolltiG to ess ol” ortt of : eae sort yniiTih rt Nir (lage woh =) Me a = &-76 “(MVTV) wotitiien’ tise jneee PaaeMh bibl Brewiniedircalgrers : 8 felmut yon ab mnegemmito etare-biidal ite | Si ite ae oleae ' gee veseerimrio aA? overt wor oyise esHM It Se a coo i var wh Ge gumarHerre Page 21 SS SSS SSS SSS SSS SSNS DO THIS: THE RESISTANCE SHOULD BE: Measure terminal 1 on the transformer. Set the ohmmeter to the RX10k range. Measure pin 3 of connector BA. Measure pin 15 of connector BA. Reverse the ohmmeter leads. Measure pin 9 of connector BA. Disconnect the ohmmeter leads. 25 {2 or greater. 100 kQ or greater, 200 kQ or greater. 25 kQ or greater. FINAL ASSEMBLY Refer to Pictorial 14 for the following steps. ( ) Install the bottom plate on the chassis. Use four #6 x 3/8” sheet metal screws. Carefully peel away the paper backing from the blue the chassis at the location shown. Be sure to refer to the numbers on this label in any communications you have with the Heath Company about this kit. and white identification label. Then press the label on This completes “Final Assembly.”’ Proceed to “Installation.” BLUE AND WHITE LABEL #6 x 3/8" iss SHEET METAL AN SCREW Ke iS) | BOTTOM PLATE : ee Pe WO gy ; | PICTORIAL 14 : wi Says : 38 C.JUONG JOMAT2IGIA ANT. . ‘edensg 622 oof fs arene 10 Tei BOT navsorg 1 (eS ” ” Aa 1 + 9 ¥JSWEeeA JAMET. ‘. | is aqure priiwotlo? efit rot prt tnciel eit) vo techn orl : ee ek ; : POM ort sitive Over » Bib Wig? eel) aireerte arth Ho niale AOERS OSS! ‘ cs J , ! . YS “en 5 ref rater of bye 0G nwode noltenat ey re alaario af dy arrolheo nuerenes yew ri x ot alr Tadd yrsediernsS: at) a ; : i¢ 9 if “Gaile gait nneont Qritsed wosq ity. yows feo ¥ setqmeo wit, no ladal ert? wore neni Jedel motzeoitiznetl exits a, ani" oF besa “etdenpealy tah ¥ 4 of , r b yy i Di JALROTOI Page 22 : a=) INSTALLATION Figure 1 WARNING: Before you install this Power Supply in a vehicle, measure the generator or alternator output voltage. The voltage output of the charging system MUST NOT EXCEEDS OLVOEIS: MOUNTING CONSIDERATIONS It is recommended that you mount the Power Supply under the hood. Figure 1 shows several possible under-the-hood mounting locations. Choose the location that is best for your particular installation and allows adequate ventilation and protection from water spray. Mount the Power Supply as near to the vehicle battery or starter solenoid as practical. This will allow the 2-wire battery cable to be connected to either of these two points by the shortest route possible. It is preferable that you mount the Power Supply with the heat sink fins vertical to provide maximum cooling of the transistor. However, this is not mandatory. ( ) When you have decided upon the mounting position, use the Power Supply as a template and mark the four hole locations on the chassis. See Figure 2. Drill a 9/64” hole at each of these four points. #10 x 1/2" SHEET METAL IS — HOLE SCREW Refer to Figure 3 and prepare the end of the 2-wire cable, ( ) Remove the nut from the negative (—) battery cable clamp. Slip the terminal of the brown wire over the bolt. Then replace and tighten the nut securely. ( ) In a similar manner, connect the red wire to the positive (+) battery terminal. Tighten the nut securely. Connecting to Starter Solenoid ( ) Route the 2-wire cable to the starter solenoid. Make sure the cable clears all moving parts and is not near the exhaust manifold. Allow sufficient cable length so the brown wire will reach a good ground on the engine, and the red wire will reach the starter solenoid terminals. Then cut off the excess cable. Page 23 { ) Refer to Figure 3 and prepare the end of the 2-wire cable. (_ ) Connect the brown wire to a good ground (engine block or starter mounting bolts). { ) Connect the red wire to the battery terminal of the starter solenoid. This is the terminal to which the positive (+) battery cable is connected. PU SRS 7 HOLDER Ss ye See Ten Nats HOOK-TY PE Sa LUG NN hey SS Figure 4 SWITCHING The relay in the Power Supply is energized by applying 12 volts DC to the relay coil from an external source. All power to the equipment with which the Power Supply is used as well as the power to the Power Supply is controlled by the relay. In effect, the relay is an on-off switch for the entire system. Some Heathkit Transceiver and Transmitter assembly manuals have specific information for power switching connections to the Power Supply. If you do not have specific directions on this point, use the following procedure, There are basically two ways to obtain 12 volts DC to control the relay. The first, and preferable way, is from the ignition switch. The second way is directly from the battery. Either source may be used. An in-line fuseholder, a 1/2-ampere fuse, and a hook type solder lug are supplied for this purpose. Prepare the fuseholder as shown in Figure 4. FY ES ee4 ~ 2% eA ee. : eviw-S arty fo bre ert aaqeng brs £ erg or whe ..) ae ; wawone 2h ove “" i ides 7 ~ P * enione) bewow boog $ of iw nword off Yoamop . { } ahi gtinquom wer 10 ded ; ae. 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Connect one lead of the fuseholder to the 12-volt DC source; the other lead should be connected to either pin 6 of the 8-wire cable connector, or to the blue wire at the free end of the 8-wire cable. The relay can be energized by grounding the other side of the relay coil. This is usually accomplished by a simple SPST switch in the transceiver or transmitter with which the Power Supply is used. The brown wire at the free end of the +12 VDC GROUND GROUND —130 VDC +800 VDC RELAY RELAY *250 VDC LOW TAP 300 VDC HIGH TAP Figure 6 8-wire cable should be connected to one terminal of the switch. The other switch terminal should be connected to ground. When the switch is closed, it completes the 12 volt DC circuit for the relay coil and energizes the relay. The relay then turns on the complete system. Figure 6 shows the voltage present at each of the color-coded wires at the free end of the 8-wire cable. Connect these wires to your equipment accordingly. OVERLOAD PROTECTION If an overload or short circuit causes:one or both of the circuit breakers to ‘‘open,” the Power Supply must be turned off for approximately 30 seconds. This allows the load delay thermal switch within the circuit breaker to reset and close the circuit again. IN CASE OF DIFFICULTY This section of the Manuai is divided into two parts. The first part, titled ‘‘General Troubleshooting Information,”’ describes what to do about any difficulties that may occur right after the Power Supply is assembled. The second part, ‘Resistance Checks,”’ is provided to assist if the ‘“‘“General Information” does not clear up the problem, or if difficulties occur after the Power Supply has been in operation for some time. sin’ ero soviguens bem foo yetai art 16) Rynie OC ule ye Ofaijonat ¢ > noe Iehsg ayattuy het sa fo She oot bh YigniDiGaos ITEM Ups tity Va. i eM Mo ay ord att to rod to ano nemo Hust tore od tun Viegn wwe ery | af0 sevOore & +7 TORR ‘te ae of raed! hues ort nisitiw cha ¢ fr vase” Uf, Tae math A sat ” ewhw Ysbco-o}e- rh edwwy ead freial - Bt ee yo er be -Re— >) Ja! < s 5 OtiV St gan ae & AVORD THY ‘OMIORD rAJe Qe net th ie ery COG sail? : £137 4 TASS : YAJ3F : qT WO DEY Gas" — Sew GaTHdIN DOVE At ocr eite ee -teroenieo od bibida alas asi or levered at talascorts “anions recive veto eT ripilve “Slew Sf ates Te ee cnaee seb rladiwe er noe Deo | we move veley } UOITOATORY CAD IRBVO i bwolmyo As tH tials visterherada vol fe henrng Trae Werrvet rinaa fiw Tie 2 Lyrsvorue ww 32A2 vi 1 edie Bas: “yi aiens at beblyorw 4 ait painoien'l” ten one ait rinidowg act qu wal fan asia * notinewotal leseral uty ti e4) ead vigawe bl oat ‘“otte ques asiducliT> i) 3 y ween? Ofaee VOT NP go gh + i 7 ’ i-9% cl } 9 % j f 7 +i _ L \ ‘ ne eal 4 i ee “@ ) ’ r i - fi, ah 7 "F 1 7A : @ Gut sot Ty sl >. Tak oe " wis ' 2 i= = 6s t. tf iy 14 4 Os Tees } = i er. fh thesk Hail : Wy ® : ag Spay nes ae a ek ea “9a snI20% Ilsa “TAME MRSS VeO?eIIA OF 7 - aL 80 NOTIWe MOITI“O: 30 BO TAVTIAS DVIT1209 OF JAM PRATT a) TIO? AITAAT ra BUT WOON “au wade. - r 2 Belt oe ica ¢ on i | yo ie = 1% ono. sana? 2 4 il works a gelood reche ant joa DG HO¥ET otf. o& abide aiden avw-B orlt fo 6 aig. wittio of sedesentd wl Me otiw-B od! fo bie eet ort te oviw auld afb oF 10-3 = be abe wee sie inlibiiinn el adbene 1a Ta% vicimis » vel Redaliqenonsa ylloued a elsfT tide ‘ett rbictw ti’ watimered 10’ wviecenet eA ¢ Hie Son ere eS .bety a! Jn oft sane cole ‘eahinsd eucin ae a _< paoipenietit gnizooripiduent leyened" elit J yoko yoru tet! eaitival i ye suede ob or maw. § Fh caren paren 3 egy GeguEarHEKire Page 25 GENERAL TROUBLESHOOTING INFORMATION NOTE: Inan extreme case where you are unable to resolve a 1, Recheck the wiring. Trace each lead in colored pencil on the Pictorial as it is checked. It is frequently helpful to have a friend check your work. Someone who is not familiar with the unit may notice something consistently overlooked by the builder. About 90% of the kits that are returned to Heath Company for repair do not function properly due to poor connections and soldering. Therefore, many troubles can be _ eliminated by reheating all connections to make sure that they are soldered as described in the soldering section of the ‘’Kit Builders Guide.” Check the values of the parts. Be sure that the proper part has been wired into the circuit, as shown in the Pictorial diagrams and as called out in the wiring instructions. Check for bits of solder, wire ends, or other foreign matter which may be lodged in the wiring. If, after careful checks the trouble is still not located, check voltaged readings against those on the Schematic. NOTE: All voltage readings were taken with an 11 megohm input voltmeter. Voltages shown * are with no load on the output. A review of the ‘Circuit Description,’ and a study of the Schematic Diagram will help you locate a difficulty in the Power Supply. Check for loose hardware. difficulty, refer to the ‘’Customer Service” information inside the rear cover of the Manual. Your Warranty is located inside the front cover of the Manual. RESISTANCE CHECKS 1. Resistance from terminal 1 of the power transformer to chassis ground should be 50-100 2. NOTE: This should be measured with an ohmmeter on the RX1 scale. If the reading is below 30 ohms, either Q1, or Q2, or both are shorted. Reversed meter leads should give a reading of approximately 2 (2. Zs Make forward and reverse resistance checks on diodes Di through D7. This can be done by using an ohmmeter on the RX1 scale. In one direction the resistance will be 10 Q; reversing the leads should give a reading of infinity. If the readings vary greatly from the values given, it would indicate that the diode is either open or shorted. Sh, Check the circuit breakers for continuity. Also make sure the fiber shoulder washers are properly seated in the circuit breaker bracket. 4, Disconnect one lead of filter choke L1. The resistance of the choke is approximately .6 2. 5. Use the ohmmeter to check for continuity between the various transformer windings. NOTE: The transformer leads must be disconnected for this check. Since the relay is on the on-off switch for the complete system, check its operation. Also check the circuit breakers. Repeated opening of a circuit breaker indicates an overload or short in the circuit supplied through the circuit breaker. wioess of aldery oie Uay Seth Bhs GBA fin HF -3TOR ‘woranond? novenmnctal “soivaec a Se gift of ein vtiaot ti yy i new wwoY jewel seth fo yaves Yeo? Seth ebient : tesnasg proton it Nec aIaAIe rt & +0 devil wt to avon moe eaalac tas teas yinneupert ai a Letom a ti mo |sGtoGl ertt ' gnoemo? how 1 ucy, daerl> bryplyt 6 sVeRGt iste aROaHD x oMATatean eniton vert fidw arth dslw eilirns) Sea ah , "sabia 1 aa i spe nit P rev evvey er ieyar. 28; — att te | thane. poet sonddelveri Jf 4 j ufT STOW <7 207-8 of phate hnivere siventto “6s ‘ive of bermurey oa sar at) ot fo ROG i rte ae essermts ap the Iwao od bloods of aub visor, epitandt jon GB. vieqst vw? 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WreAEMO VAR t! ox: ny -ult-te ) ‘ Ho pov uel tit ree 5 bh Dede tara no heot¢ neowied ywitelinet vot soedh co iemneito a ett. ot ATOW .teMlbriw cermobnen eiey SAP. ‘ Yovbur a ‘oaks nidtiqhoes@ pias” ot seas nacti zits wo) Daraaneeraile OC SeyEN aio soerrwstertatk é‘ meact uoy gion thw mage i aetanios int iat tpiwe Reno wt oo 2) yee 5 oHae Pr. . wigque won ort: pone fivold ety Presets ot A OVEN WEYO £2) sorts Redeye ' ; a i ion i ied 1 4) coneve fe-espnaltel walews eens Vo prima RabmeeB) | revit soot teed rivaws pei ae ou peilaery 4 tHlogis ws nr trork 1 ' - 4 : + iy id 2 bh 1 = ' ' } r 5 ? i j ' > = Pac d 4, ‘ i 9 { ) Y a: t ‘ i e 2 7 j J ) i} ‘ ‘ 7 1 : a ¥ fel 3 eats Wf ie ‘hy ¥ = ~ % i r : ‘ i > f et tf ‘ Dy = At | i f ‘ ‘ i C @ ae Sa Ln J a ' " My » ea aan) meme ‘ i ae fave 22 [eegeearerr] * ~- « oh | t us ft MF i " 4 ¥ 1 ya \ , cfd iM 4 -— * = 5 oA Ps J sy he A 44 ip = 4 "the say P { amu gs ry wiy a Page 27 GegrmareKire SPECIFICATIONS Ce? i. i ee ce ee 12 to 16 volts DC (negative ground). ECDCEE CUI ONT O°... AMM Re, Saree 2 le ye 25 amperes maximum with full load. Allowable Ambient Temperature ............. —10 degrees Fahrenheit to 122 degrees Fahrenheit. righ: Voltage Outputeeene foes, oc elas owe ae 800 volts DC with no load. 750 volts DC with 250 mA load. Effective Output Capacitance ........... 10 UF. Ripple -< oc. a eee ree. ees eke 4 MR Less than 1% at 250 mA. DUtY.CV Cle: AEE ee 8 ae eee els Continuous up to 150 mA. 50% up to 300 mA. SSB duty up to 300 mA. Low Voltage Output{Higit tap) 4 ...8. ....65.. «. 310 volts DC with no load. 300 volts DC with 150 mA load. Ripples ower. eee Ce en ee Less than .05% at 150 mA. DUTY: CVCl Cle akon an mene Cremer Me ees rs Pa a Continuous up to 175 mA. Lowy WORKER OUT (MeN TERY 4} 6 6 ob ne 6 8 8 a oe 265 et DC with no load. 250 volts DC with 150 mA load. int{ayey sy Se ne Al Seale ahs oer Re eee LA Apes gacestase Less than .05% at 150 mA. DUTY CVC Chai ernc: Wc Gk an te aR ake eo le Continuous up to 175 mA. BiaseVoltaGe pe one atucis enetemeomad ucinste ees) anh 42> curshens SRE) < —130 volts DC with 20 mA load. DULY CV ClO in ecu memees: ginette lami wig. Nag RLS Continuous up to 20 mA. SWITCHINGuECOCUENCY a tk kt awe ere eine ers 1500 Hz (approximate). Cabinet DimensiOnsic-.. Bee suice costs fee te tee teen tees 7-3/4" wide x 7-5/16” long x 2-3/8” deep. NGTVVOIII coe cs ne ck ota i eae a ek a 5-1/4 Ibs. NOTE: A 13.6 volt DC input was used in determining electrical specifications. The Heath Company reserves the right to discontinue instruments and to change specifications at any time without incurring any obligation to incorporate new features in instruments previously sold. tS age% , a ' rr ar Lad e we 4 al 1 a | =h 7 ts ie a Ta oes ‘ M a - ‘ : ay ‘ * ie as t -~ Ries teat 20 aor nd ot St ‘bool tit pre mmursiiceed annie as serie? eat est ot + sara rate Ol-+ —— we! on daw od wily 008 uel am heed Atiw ” ehiav ON ae halite pm oat ta vt nedt see! | Porn ina Arn GOG 67 Queue Aon OOF oF queyrue? ed foes! oer Phi OO atiow OTE ; ; ») Pom CBT Te REG, niotit ad rer ant. ae au caamiialinnd trace! on pitiw 30) afev 380 won! 400 oat atrw 00 ajleyv Des “en ‘hen tet te #20, qarte aad Ayn Bt ° ams aouriltned tme| Ave us ari ‘90 ation CE f~ J - ae an 08 a suoontin a ea luca $A 008 " 4 ine “Pet x yrs “anan stabiw “PEN HS ne sett <7 Fi i =) } uti j ae 5 4 1 ‘ ; ' i ; ie oe a | mil hs { . a a ‘ 1 er 4 ves 17 ad - U & ° + oe a . 7 | ' r i # oa i} tity ~ 4 7 ‘6 - — al i ¥ Be ,«- Jie ce* Ses ie a ee Pe adit) . ( 0 i ‘ ‘ i i ‘ ° P Yiw «ew ee eee ie! oer 2 = =% - cs a Z ; 2 * - *«# se« « | @& * 2°? eo 4, Ore * - Vr , Dart t \ ' » 4 * N wd =a. oe eS ee ee a ' i Pian i i * eh 3 ‘ = ! NS \y TAD og Bcd = + wt © oe ry { te) rt z i SS ow i & - « * ee ere = * - somasizagsd . ¢ ' P = Wi bee ce ate ee ast * ne . * ‘ » eo 0/7 4.228 * © bee Ae re ue. 5 - * euec kh . *% #58, 8 * eevee ., e ‘ ‘ Sifted bls Hi et eee Di , 4 j ste ‘ . ‘ bo lhe @o@ a) ee Ew ip ye = =A a Bei, r he ft Soe os fats [Sgeearsxrr] CIRCUIT DESCRIPTION Figure 7 While you read the following ‘Circuit Description,’’ refer to the Power Supply Schematic and Block Diagrams and to the Figures in the text to obtain a thorough understanding of the circuit operation. PRIMARY CIRCUIT The battery voltage available at the 15-terminal input-output connector of the Power Supply is applied through a 40 ampere circuit breaker to the relay contacts. When the relay is energized by external switching of 12 volts DC to the relay coil, this DC voltage is connected through the relay and through a 10-ampere circuit breaker to the filament voltage terminal of the connector. Battery voltage is also applied through suppression choke L2 to the center of the transformer primary winding, To produce the high DC voltages required to operate mobile electronic equipment, a suitable converter must be used to change battery voltage (DC) to alternating current (AC) for the necessary transformer voltage step-up action. In the Transistorized Power Supply, this conversion _ is accomplished with two heavy duty transistors which act as switches, and a very efficient toroid power transformer, The switching action of the transistors is similar to that ofa vibrator which uses a contact-carrying, vibrating reed to energize first one half and then the other half of the transformer primary winding. However, a vibrator is an electromechanical switch whose contacts may, after use, become burned and pitted and require replacement of the vibrator. The two transistors also alternately connect battery voltage across first one half and then the other half of the transformer primary winding. As there are no moving parts involved in this system, mechanical wear is eliminated. Transistors have extremely long life characteristics and require a minimum of maintenance. Transistor switching action is shown in Figures 7A, 7B, and 7C. The basic converter circuit is shown in Figure 8, which indicates the relative phase and amplitude of the primary and secondary voltages. When power is first applied to the primary circuit, an imbalance will exist between the two transistor circuits due primarily to slight differences in transistor and transformer winding characteristics. This imbalance causes one transistor to momentarily conduct and apply battery voltage across one section of the transformer primary winding, either section A1 or A2 depending upon which transistor is in initial control. The polarity of the base feedback voltage, with respect to the transformer primary, is such that it drives the “‘initial control” transistor into very heavy conduction; collector current is several amperes, depending upon the load on the Power Supply output. Degeneration causes the other transistor to be cut off completely. are bemrud enwiond a! bes Basti x) : ; Apart Trarscaiqa’ eum 1 sHad IennGo yietectelia-oale ruibisnalt covt tj ito. arte cord Grn Tat ena MOR on qa qsedte 2A gnibniw yedniic ennobled wow leoltesiwet oveteye sirth ni ha dio veri sisiebseerts sil gHol. 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When core saturation occurs, the rate of change of flux approaches zero. The circuit is then unable to maintain the large driving current in the base circuit of the conducting transistor, resulting in a decrease of collector current. This decrease in collector current causes a further decrease of base drive. Circuit feedback is such that continued reduction of base drive causes the conducting transistor to stop conducting (switch off), and the other transistor to begin conducting (switch on). As the primary circuitry is symmetrical, the operation of the second transistor is identical to that of the initial control transistor. The conditions are duplicated, causing resaturation of the transformer core. This rapid change in core saturation induces a square wave alternating voltage in the transformer secondary windings, in proportion to the turns ratio between the primary and secondary. The cycle will continue to repeat itself and produce the necessary high voltage AC in the transformer secondary windings. The transistors operate at a nominal switching frequency of 1500 Hz. This frequency represents a good compromise of efficiency, filtering, and operating temperatures. At higher frequencies, the time required for the transistors to switch on and off is a large portion of the operating cycle; this results in low efficiency. At lower frequencies, larger value filter capacitors would be required and a much larger transformer would be needed. The switching frequency is determined by a number of factors, including transistor circuit values, and transformer and transistor characteristics. Page 29 The transformer used in this Power Supply is a very efficient toroid type, designed to operate at a frequency of approximately 1500 Hz. The transformer will run relatively warm even under no load. This condition is normal for a transformer operated near or in a saturated condition. Transistors used in this type of switching application operate at high current during one-half of each cycle. The transistor heat which occurs is effectively dissipated by radiation from the heat sink assemblies, which are cooled by air circulating around the heat sink fins. SECONDARY CIRCUIT High Voltage Section The high voltage DC section uses a full-wave voltage-doubler circuit, consisting of diodes D1, D2, D3, and D4 with capacitors C3 and C4. A voltage-doubler circuit produces a DC output of approximately twice the peak value of the alternating voltage available at the secondary winding of the transformer. Diodes D1 and D2 rectify one-half cycle of voltage, and D3 and D4 rectify the other half cycle. On alternate half cycles, capacitors C3 and C4 charge to the approximate value of the AC voltage appearing across the transformer secondary winding. The polarity is such that the DC voltages developed across these two capacitors add together; this ‘‘doubled’’ DC voltage appears between ground and the junction of D4, C3, and R3. Capacitors C3 and C4 with resistors R3 and R4 provide filtering. R3 and R4 also act as bleeder resistors to provide a discharge path for the voltage doubler capacitors when the power supply is turned off. Buffer capacitor C2 absorbs transient voltage surges that occur in the secondary winding as a result of transistor switching action in the primary circuit. Low Voltage Section The low voltage DC section: also uses a_ fullwave voltage-doubler circuit, made up of diodes D5 and D6 with capacitors C8 and C10. Capacitors C8, C9, and C10 with choke L1 filter the DC output voltage, which is then applied to the Power Supply connector. 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Yo bent aie eit to euliy © mw ar sett KO bee ED | oi <2 ‘ cogs iattase neler rons rR ee tod wethad veseoning to tual © 25 gaint ay ow | AIT a : ihe reer, pa arth wrt rr pally node Witt 10 908 fue - od Ae alecih 4 The low voltage secondary winding is tapped to providea Bias Section choice of two different output voltages. Either the blue-green or the blue-yellow transformer lead may be The bias voltage section uses diode D7 as a half-wave connected to the voltage-doubler circuit. The blue-green lead _ rectifier. The filter network consists of capacitors C11A and provides the higher output voltage. The choice of output C11B with resistor R8. Resistor RQ is a bleeder resistor. voltages depends on the requirements of the equipment with which the Power Supply is used. CHASSIS PHOTOGRAPH POWER 40A 10A PLUG CIRCUIT CIRCUIT BREAKER BREAKER evow- tind a. an. TQ: sols a nord | villas prema oni a ed yarn weet bra 45°) moriganes to erizrina drrwies HiT att iHitew = bee et rasaieg Tee SRGA hesananiiiiibimmapheabi Soc pcsony 10 ‘lori aT me nS oe NaAROOTOHA I2BAHD. a, rae THADAD ., 2TH YOR ee Aawot } , , t] oy & » 4 LA | y f ie < i a = 7 oz “] 7 ~~ Fae OF PGE a pwr —— = ad GaegrrsrHxKire Page 31 X-RAY VIEW NOTE: To identify a part shown in one of these Views, so 2. Locate the same identification number (next to you can order a replacement, proceed as follows: the part) on the Schematic. The ‘Description’ of the part (for example: 22 kQ, .05 uF; or te Note the identification number of the part 2N2712) will also appear near the part. (R-number, C-number, etc.). oF Look up this Description in the Parts List. oe | Ae : EY 3 (Shown from component side) -. ie Os aes A a aa —— “fr _ » 7 ares s) can x , S ' oi 4 ; =s j : 7 oe = & , » 2 i f Ph ve ~ 7 — brbegh Hood (WIV YAR ox eewn) waderan nolfsaitunebi sxapertetenod Be Oe awei seers to | “neighees(*) ariT ..gitermree eer ne (ree, ett 4 | * ms &. GA SS salomexe aT) nog od bo ; Fg ats an wots ct He SI ee he ( ti crew ott ol noire: reed sith qu: too ; Meer key Oe oe. oh aca ate ' 4 aie uf ' ay 4 nate ; eg et Wa wl a ee Trl ¢ ia Si a - he a ae oy Ly a ee a bed We en, ‘pet, ~ = MT eek es j 7 ee o ’ 7 A bh ae ; : 7m) fis % ss ; ae oe p p is! Jd a igeent 7 ee vA Ny ,*s Ae =? i r 4 iy aT A Nite areal ; ; ‘ . | if va : fa CS ie ae ‘ lobe f-ie ary 7) ’ 7 ry : Am vi Ae re.) . oy ‘ ae _ | , q ee” SCHEMATIC OF THE DC POWER SUPPLY HIGH VOL TAGE RECTIFIER HIGH VOLTAGE FILTER HIGH VOLTAGE DC OUTPUT 12 VDC OC TOAC L, LOW VOLTAGE LOW VOLTAGE LOW VOLTAGE TRANSFORMER rte CONVERTER RECTIFIER FILTER EAA BIAS BIAS BIAS OUTPUT FILTER RECTIFIER BLOCK DIAGRAM ESOS AES SU TANS val HEATHKIT® TRANSISTORIZED MODEL HP-13B 2 a ' ie A " ~ ; , ri ——aee eS t—“‘“_OS | é i ni * = if ‘ ‘ x a) j a > = 7 : F +4 * 2 v - ~~ S . : . b; : ~ fe , . ; ri ; “st \ Sw i y 4 > / ’ a f ' i ia i i | 5 - - v sHT 40.997 aAmanoe anew ” ia os i P+) eH TASH ve P i sasinoTteievaay ; y yeque Aswort 3a : ih ee ; 521.4 J200M | . > site Fated bith ] soar. ‘ {or wD. ee a i: _ Seer |. water : ca] i - ae - ; aS 1 MG. i® saat (ON: re - beets Nes vA Tee = +. forvae’s ’ : ic ueiate 2 i t , rams ar’ , ve : - F ; oe | ; —~ au ol hea oe ers Cpl i hide ‘ rf | i —s é ~f " ee 4 j | i i , 4 f \ : oF t ap 2 g ‘ ; fi 74 ee ry) 3 oft : i r f ; A , > ~ + | 490° wt } jie ae i ; | | ¢ ; vs tr ane ; SA a } §OAT 30¥ t f ‘ 8 | SOL %) - 7a¥v re o| Otte] waa) ase ovo0s+| Sov | | 20 : Sy ry A ,* 8H $i if rat Se ‘ ; a Le vn a Sev $14 pe er a Ed | PAO : a Se a ic ou “) Lil j bub} a = L ae iP bi aan] gemnseml - { ty Prey , * } 4 * by twee) tas es. AYMAINE T va? Wort gary magvens erg Pwdst ‘ §y99S 238 WTIW Dae-tt SVAH vam rT) R05 fO\ ona 44 90s Lowa VATIGORIO DIMDIVS Pad WORU ARICKTAS te oT ty a 4 Ihe, ‘ sf Ty - i oe os : ey ss a 6 ® A 7 ; F) : _ Pi “jie ’ Ay. hort ote af r Cre SAG a 1 : r ; ith! th ‘ 5? ean i. Tks ily 3 4 “fF e » “« ' awe zat. Se jt ea ous y peace o. WAT WOs 3S V dete te ey!” owe BN pa ae ‘ AAT DIK DEV QUE) oa wot Bb a ae : 3 a ver aue MARS, ive é a ; Assembly and Operation of the a TRANSISTORIZED DC POWER SUPPLY MODEL HP-13B Gc ODE SED PMAPRIM TATE Wins hNeoauprBre ar tye ont" TABLE OF CONTENTS IntroductionWenee sFeaan.. Seseried. Teese Sti: 2 Parts List? ©. SoC ORT Oe ee. 2 Step-by-Step Assembly GirculBoarcditwite tena. suse sic) soins 4 PartssMOuntinGmeciec) cle: os tee ee Gute 6 Wiringent, tre 1s Sas, Paes ane, Paey: 11 GabletPreparationtime, oF. % Oca. St . Ge 18 SEVIER eles Sautb ioe oe, Ba & Geel dada ook 20 Rinal Assembly # Seer 91. seen soger. Ame 21 IREENERTOMN cc Boge pol oe 6 6 thao oh 2 hon He 0 22 in CaseoR Difficulty. Oe eran. Pee, en Sere 24 SDGCihiCa TONS mamma ee tees BOE ero eb aid fo! jeomel inc 27 (orients (Byavetnjekstelny 6 6 o G@ bo 6 OCB oo oF Fe eo Greta Ase Glo o @0 0 6 OA Bole & 6 mea 30 eRaV iN LOW ate teeenmTAn Sees tts rena nae lta et ee thi 31 Schematic. . (fold-out from page) .........-. 31 WWETREY? 6 cco Bote 69s Boche oe Inside front cover Customer Services. . -Peam fa.) olen Inside rear cover HEATH COMPANY BENTON HARBOR, MICHIGAN 49022 craalwadud.) | tie ee . [<4 #TVATUOD TO 34GAT 7 an rt atigS . . * yldtorsae a ast veer 7 |. a De we 5: ok A ee ~. inset stand : = The hee Pei ‘. Srtnwoh sie 7 . pny rede wars aleieD ay vicie tania vue A 3wo . molyriierent | x ‘aauaal a : ~ yntuisitiG tals) ; } ys a 5 ‘aes srrowranitivege noitalionsG unio dewmdroit® nieeertd P wal Vert | (egy mot! tuotiot. . cbenmede oe 2snov abient Pe +) alten sf “fi. . Vines avoo taal Obie. . 4-5 6 Os, me mi wrrerrad e ee “a 2 1 ! J 2¢ A r if > - o i ef a ‘ . Weta ss , vi 7 a ti 7 uf 4 ~ ; es ogi « + YUAAMOOD HTA ‘ . : Ty ot es . £$80ke AagHoMm \ * o Oa ‘ “s t ee a ar ; ’ e t a TH Goh wt Page 2 ib [Seger arses] INTRODUCTION The Heathkit Model HP-13B Transistorized DC Power Supply was designed to furnish all necessary operating power for Heathkit Mobile Amateur Transmitters, Transceivers, and Receivers, as well as for other brands of mobile equipment. This Power Supply is actually three DC power sources in one unit. It provides high voltage (750 volts), low voltage (300 or 250 volts), and bias voltage (—130 volts). It also switches DC filament voltage for the equipment with which it is used. Circuit features include relay control of all primary power, plus individual circuit breaker protection of the DC input to the Power Supply and of the DC filament voltage line to the equipment used with the Power Supply. The circuit breakers are the automatic reset, load delay type. They insure positive protection for all equipment involved in case of an overload or accidental short circuit. The power transformer, an epoxy encapsulated toroid unit is of advanced design, assuring maximum efficiency. This transformer, in conjunction with the power transistors used as a DC-to-AC converter, provides a high frequency switching rate along with high power and instant starting. Specially designed heat sink assemblies provide maximum transistor cooling. Efficient, long life silicon rectifiers and heavy-duty filter capacitors, mounted on a rugged circuit board, provide trouble-free rectification and filtering. Because the complete Power Supply is physically small, it requires a minimum of mounting space. Under-the-hood mounting is recommended. Read the “Kit Builders Guide” for complete information on unpacking, parts identification, tools, wiring, soldering, and step-by-step assembly procedures. PARTS LIST Check each part against the following list. The key numbers correspond to numbers on the Parts Pictorial (fold-out from Page 3). To order replacement parts use the Parts Order Form furnished with this kit. If a Parts Order Form is not available, refer to the ‘’Parts Replacement” inside the rear cover of the Manual. Any part that is packaged in an individual envelope with a part number on it should be placed back in its envelope after it is identified, until that part is called for in a step. KEY PART PARTS DESCRIPTION PRICE _No. No. Per Kit Each RESISTORS Al 1-3-1 3300 22 (orange-orange- 10 red), 1-watt Al 1-46-1 27 kQ (red-violet-orange), 10 1-watt A2 1-15-2 1000 {2 (brown-black-red), 15 2-watt A2 1-24-2 100 kQ2 (brown-black- 15 yellow), 2-watt A3 3-1-24 4 Q, 24-watt, ceramic .95 KEY PART PARTS DESCRIPTION PRICE No. No, Per Kit Each CAPACITORS B1 21-35 3 .005 uF 1.6 kV disc 15 B2 25-254 2 4 uF electrolytic 50 B3 25-206 1 20-20 uF electrolytic 85 B4 25-207 5 20 uF electrolytic 85 B4 25-28 1 100 uF electrolytic .60 B5 27-20 1 .4 uF Mylar* 30 *DuPont Registered Trademark o tiny Blotar baleiueasone yxoqe nn setmotanet towed aft ads oa ‘ poiletalaiett ae ‘ yoneioitte mumixem goituess nglesb bearevba, ta. Enitewngo yieesen ile. tiger? of beeu Poglerant two erty tthw noitpaMinos ai yengned PeaintaneT wsarmA: wide “thal 15a mbivq wnewtese 24-0100 @ a. he abrad wriro wt Pet the *s dacs eT inaseni bne ewog Agkl diiw grote ere ani tatiwe re q . £2 aa sailderenea ants tend bere ‘wheisr ain? reper? Oort-erh who ifvat wan Sbivony vivb-yvestt bos emaititoey noite oti! gaol sneiott® mertortvie ouls ; Bd ‘ttle O61) ouatlov og ,Owod tiumis beggin @ ap barnuegy wrolioaged bay wh 7) tai a anne et pniveth? brg naijeoiliroe sevt-etyow « ENON SHBMHFNOS WGN “wD swe 1A” OFS bea he ty gang of haview InntGiue Me at RowvetoTT #1 i ee) at obler (Tie iolevne ieublibAl ne eb Segntaeg et-inrtt. wg yoA oy mene rp adi ni aed becalg td Wore A ho wedmun seg "Emer nor oni wt belies & Tang seri? Mtnw baitisriety eit For) iy ag» wibViat wae. ¢£ sitylotools WP CG oirviotale iy OF-05° r a0¢-a¢ siryioroele Au Of nr sitylowoale Sy GOT. r t ‘igia : nh. yagepud yume" efeieniwo aay. srumood ‘ a? suani 50 arg Fe cies alesid siugila | Soage yiiirnam to eraarrayizry & sstiupey ers 39 anil eucriny yrenalt 30 oft Yo brs. ney RATIOS QW load nOMasinwe: arwg Qin : . _ iuano rene pe \ppatee = yoiTunogga -grAaa THA? Yad aOR ah: =u, ~, . pevlbroow;, Venere cater iene ‘4% ‘WOITQUGORT vi hz bal : / xe yee: pnifoeo vatelaned. ne 4 worn wiakciele vi. cory eyetioy wot ,lartov OBN} +s er Wal t2 Wik i vie ead u ‘bebnsnwmoos 2) gelrnagern ervortesed tiumia ont videt@-tewnd arte ‘fiw beew 40 ' suent vedi mig yor Swot Jeon . Ter eTHAS evry mogkey A eet -arft of whet atdeltovis “nent ae fauna or Yoweyoo Lf matt tt eink ae ee ie ee BROTIQAIAD gers fa sar. baS-25 SAP ‘ba J or. | Oper. eB EOE. Oe T Bt, : QR ; 86 . we: i at remeber, barpraipeh rcWwa* F 28) bi beece: q % aid a we , | a rh bal es rt ~ eae a ar 1 re ee ae 7 is wo Pty a oA an ane 7 ne am - a j | F ont \ 4 ae ; : } v a : rs ie 4 - Rs Pe 6. Ge guEarHKirTe KEY PART PARTS DESCRIPTION No. No. Per Kit CIRCUIT BREAKERS-RELAY-CHOKES- TRANSFORMER Ci 65-20 1 10-ampere circuit breaker C1 65-16 1 40-ampere circuit breaker C2 69-68 1 12-volt relay C3 45-59 1 Suppression choke C4 46-24 1 Filter choke C5 54-144 1 Power transformer DIODES-TRANSISTORS Dil 7-27 7 Silicon diode, 600V, 1A (1N2071) Di 57-42 1 Silicon diode, 100V, 3A (3A1) D2 417-120 2 Power transistor FUSEHOLDER-PLUG-CABLE CONNECTOR E1 423-10 In-line fuseholder E2 432-34 1 15-contact plug E3 432-35 15-contact connector METAL PARTS —_ os F1 200-633-1 1 Chassis F2 204-549 1 Circuit breaker mounting bracket F3 205-417-1 1 Bottom plate F4 215-11-1 2 Heat sink (bottom section) F5 215-12-1 2 Heat sink (middle section) F6 215-13-1 4 Heat sink (top section) HARDWARE #6 Hardware G1 250-235 8 6-32 x 1/4” screw G2 250-233 12 6-32 x 3/8” screw G3 250-234 10 6-32 x 1/2” screw G4 ~ 250-364 2, 6-32 x 7/8” screw G5 250-237 4 #6 x 3/8” sheet metal screw G6 252-77 24 6-32 nut G7 253-96 2 #6 flat washer G8 254-25 26 #6 lockwasher G9 259-1 4 #6 solder lug G10 255-23 4 #6 threaded spacer KEY PART No. #10 Hardware G11 G12 G13 G14 G15 G16 No. 250-83 252-63 253-3 253-7 254-36 259-5 PARTS Per Kit BSS —_ MISCELLANEOUS H1 H2 H3 H4 H5 85-78-2 259-15 259-20 262-8 259-21 260-32 344-2 346-2 347-13 347-52 421-13 490-5 391-34 597-260 597-308 a a et et at oe Page 3 DESCRIPTION #10 x 1/2” sheet metal screw 10-32 nut #10 fiber flat washer #10 fiber shoulder washer #10 lockwasher #10 solder lug Circuit board Hook type solder lug Circuit board solder terminal Circuit board solder pin 5/16” solder lug Cable connector clip lock Black wire Large sleeving 2-wire cable 8-wire cable 1/2-ampere fuse Nut starter Blue and white identification label Parts Order Form Kit Builders Guide Manual (See front cover for part number.) Solder (Additional 3‘ rolls of solder, #331-6, can be ordered for 15 cents each.) ‘ PRICE Each .05 .05 .05 .05 10 .05 _ .80 .05 .05 .05 .05 30 .05/ft .05/ft .15/ft .60/ft 15 Ke, 2.00 The above prices apply only on purchases from the Heath Company where shipment is to a U.S.A. destination. Add 10% (minimum 25 cents) to the price when ordering from a Heathkit Electronic Center to cover local sales tax, postage, and handling. Outside the U.S.A. parts and service are available from your local Heathkit source and will reflect taxes, duties, and rates of additional exchange. transportation, 2 3° {a9 oes ow, : c er Pel Ne 0. ‘Tt i i i) ar + ig 00.¢ ot ‘Adee ect mot voastonug “fi “ine vigos’ netsh’ pyods af. i WvOS Ji vOHTUADeIG ee et tatorn sare "S\t x OM ee | gun SEM. terhew tel? wd)t Of seblvors tadit OF - veaw torlzawano! 00%. ‘qui wblos OFS tneod tutu mblow gyy? 20 vebloe bwoddiugdD log “iT Soe r] ¢ + wore TeMAd Tio - P ; tng qui whles. “Bre gilo rotaennas eidel sta yey ach ~ onlvente anne vdeo stw-f didao oiiw i saud oraqesss ely! aia with bee oule ' fecal nditasitinay 5 mont wn ae abiue) sHbling 1% notes) isunsit (yvedmaur eG ro? € ignoitibbA) wblod TEES cebtar teiloy 8? tot bebo ad nao > (ota etnies. - RAS arewtneH OF & 68-088) tr) a * cagee sta b. Leet orp >. ‘ae are t ., Boas are é 8-082 -8TD 2U03VAII352™ ; »-81-24 | Sr-eas | 1H” ¢. occas. &H g BCaS * EH S$ | fSaae he ¢ . |) Sena ee f Sone b. «ae SOM | Erte ; _ S8-Tat : Cr-fSe °° ; etsy : ‘PE ICE t ONG at CORE r = ' 2 oe bhA, .nolfehitexb A.2.U 2 of al trectiqiite exer. yragmad .@ mot? gninetno nerhw saty ort of fates Bk-mutninien) Ot Sgarecg xa waisa Iso6t wvoo-dt wins) sinetoeld solrieeh "| $70 solves brs aq ASU ot abies igelipqad. ibe “Toei Hiv bee egmwoe siicteaH Ieaol iwoy ‘nov sleliliiene FIR Dee NE ee ee ‘THAT YSN 9 Horr Aleae haan, PRORME AL VON shalhn noite. (FAS) AE. eb a Tories wed, LN t 9 adroavinos 1IORDUIGA Bm > wihioreaut pnil-nt Se Co Be kn A Lor Tis Ga JHearHxKire ( + Blue lead to the circuit board pin marked BLUE (S-1). (7 6" gray lead to the circuit board pin marked BIAS (S-2). “en ( ae lead to lug 1 of resistor AH (S-2). Wrap this lead around the resistor lug. ("1 Carefully inspect the lugs of the resistors at CB and AH. Make sure the lugs do not touch the screws at CC and AG respectively. IMPORTANT: The low voltage output circuit has two voltage values available. The low tap output is 250 volts DC. The high tap output is 300 volts DC. Determine which of these voltages is required for the equipment with which you plan to use the Power Supply. Then proceed to the steps for the voltage value you have selected. Terminal D on the circuit board is a “dummy” terminal. (Make sure the leads are soldered to the terminals and that the terminals are soldered to the circuit board.) BLU-GRN BLU-YEL ate) sar 8 es Oy 8 8 bel LOW TAP <> 50 eres ae 9A xa Page 17 For 250-Volt DC Output Refer to Detail 9A for the following steps. a (ee Blue-yellow lead to the solder terminal marked BLUE/YELLOW LOW TAP (S-1). (“Blue-green lead to the solder terminal marked D (S-1). Proceed to ‘’Cable Preparation.” |} J a ie Los BLU-GRN Cn “hres >| + Se 68 > e} Bsus wen, Sey, cates | TAP Detail 9B For 300-Volt DC Output Refer to Detail 9B for the following steps. Blue-green lead ‘to the solder terminal marked BLUE/GRN HIGH TAP (S-1). (i) Blue-yellow lead to the solder terminal marked D (S-1). Proceed to ‘Cable Preparation.” Tv! eo Nt vari — sugge 244-08 wo cyte grit we wr AG red 9 ‘ete, lecitrmed yebion eT OF beni wolbyeult At} SAT WO eleaet tad iat (f-2} © besheen ise ume abine erty ban! ae ‘sealant pidialyY’ of heart ——~. oe tT eee © \ ISS Ss SS TKS HT eae Ir 4735 | “= meq ¥ dfn we oe ae | Va i ed ee r nee A youd od )-. - Pr a ae he Wht ayr- %) i a =i ie NM _ nage i { _ ~~ _* (et) (edi) oy fay 7} \ ~« a ie f ‘ hi PES | BORIS Hts. ae en » Fen oe, | : Ps a at te id enor o~ = eo <> ——————————— 98 Hated 1 aidan arlerrvat ° yabloe' -aele at bool pemng-nult ie ae rd) SAT HOM MRA, 1 Ls coo eit kit to Sn waa en Be AS ” 9m sheninner elf zedr bre nia) 90 0-006 169 _ seat give 0 1 aa gt 9A alt S 2s é »% Poy yee . e7 eee «th 3 ee ok lg ny rat tune! diet aa (8-2) HA vats Yo F gut! _ brid 3D 20 -2vtseiesy “se ys DD te ayabte bite at ess Ton ams se 676M heed “ * spas esl Jui ‘suns agente wel oft : 20 wiov 028 3 warse-aerwole iT olded to rhatiw unkrhesee). 30 satiny ODE vi ruque ¢ “woy (oldw deve insdigloge eff 70 bevupes af 4 vot ayere ott? uf hesdosm earth glagud wot ere, ot co © ianieneT Jbetovlse avert soy eulav steni siti owe ate) Jordrmet “ypu” a tt aioptrmal oft or Be mit ie . Page 20 GeguesrHeirre INITIAL TESTS Sy Yo avoid possible damage, it is important that you use an ohmmeter to make the following resistance checks before you connect or turn on the Power Supply. If you cannot obtain the proper ohmmeter indication in the following steps, refer to the “In Case of Difficulty” section. DO NOT turn on the Power Supply until the difficulty has been corrected. NOTE: Use a vaccum tube voltmeter (VTVM) or a volt-ohmmeter (VOM) to make the resistance check in the following steps (solid-state ohmmeters do not furnish a voltage high enough to make the diodes conduct in the circuit being tested). Make sure you have the ohmmeter set correctly, since the range setting influences the meter reading when a diode is in the circuit. { ) Set the ohmmeter to the RX1 range. Because some of the circuits to be measured contain diodes, you will obtain different resistance readings if the polarity of the meter leads is reversed in the following measurements. Therefore, in the next two steps you will determine the polarity of the ohmmeter test leads and connect the proper lead to chassis ground. PICTORIAL 13 Refer to Pictorial 13 for the following steps. (_ ) Make sure the clip locks do not touch any lugs of connector BA. If necessary, bend the clip locks back slightly. ( ) Connect the negative meter lead to the banded end of diode D2. Connect the positive meter lead to the other diode lead. If the resistance is approximately 10 ohms, connect the negative meter lead to the chassis (ground) for the following resistance checks and disregard the next step. ( ) If the meter needle remains on or near the infinity mark (full scale), reverse the meter leads. If you now obtain a reading of approximately 10 ohms, connect the positive meter lead to the chassis (ground) for the following resistance checks. Make the resistance checks in the following chart from chassis ground to the indicated points. Some of the readings will take a few seconds to reach the specified resistance because of the slow charging rate of the capacitor in the Power Supply. Berra, erie BSs tf JAIROTSIF ; acste getwellot ef yw? Ef lehatal4 of ie oe aw way reel) oneery an usin @ ete, ae aie :)' gtgteeinineids sanmniion gatwaligtertt elem af io agul yrte roua? ton ob adool diis ott ou ede { } tonne fay +) wv Newent wwo'l ety No WT WF * ‘ to brie bebrad ett +” bee tom evTopen ot serine. { } sid ean) gils oe2 boned wissen Th AG yotoannoS pniwoliet: ea nl iiganion), vedernnirio pi ) ar) eee vineigile “TOW OG walters Snaps Yo oes) art ortt of i peed eeri yihuolib-ert finnu ando.Gt yidiamixorqgs a conaggien oti Ht .basl atop _.. 6 70 IMVTN) sstomtioy edu? . inyopey © eM tro ert og bee! wetem avisieog er? oan -SQ #oolb’ eisearto ort. of bes! ietem ovitager’ aft oennes 7 efit nl dooria wanazaiann arti griam os (MOW)" _+uys anoorto eorursteon grewatlol ert wt (bravo) 1 a chair? you ab erento | e2ete-bilou) Lagoa pene tite tage onl Tubnds ‘tedcib ort apa oF gudee ty Yiinite! ett wer to 016 sniames albasr eigen ait Wel Bis wan voy H 2best iefem ott exwven (one Mut) team! : rusnrion amito Of yvistamikoraas to gnivest 6 tistio otlt to} tnnuee) eleeario ort ar beet vetem, evitigog ort: i. p n Cs caaiha seetenddh cima a cei sacs esiwsitok eck TN GOA eanuiaall aussi (poheied > konibass ort to emo?’ ai0g bétaolba! elt ot bmuoyg slasado’ .. sonniales? baitioog af) ses at wbnoges wet @ sotas ili .\: eA an “ art oh secanget ot 39 Sy aR a ee lek Ph i y rae ei en i ae La ' a ~ : * oe too" 7 ae let an p ha a 5 a" i “@ eet - ; i ui an ve as oy ni 1 és ee ii , ath be a emirate “0 iit ony se Page 21 Ga gurarHxrire DO THIS: THE RESISTANCE SHOULD BE: Measure terminal 1 on the transformer. 25 {2 or greater. Set the ohmmeter to the RX10k range. Measure pin 3 of connector BA. 100 kQ2 or greater. Measure pin 15 of connector BA. 200 kQ or greater. Reverse the ohmmeter leads. Measure pin 9 of connector BA. 25 kQ or greater. Disconnect the ohmmeter leads. FINAL ASSEMBLY Refer to Pictorial 14 for the following steps. the chassis at the location shown. Be sure to refer to the numbers on this label in any communications you { ) Install the bottom plate on the chassis. Use four #6 x have with the Heath Company about this kit. 3/8” sheet metal screws. ( ) Carefully peel away the paper backing from the blue and white identification label. Then press the label on This completes ‘‘Final Assembly.’’ Proceed to ‘Installation.’ , PICTORIAL 14 < Sged Ae a eee We gt tate? OF aye of noeorte ry wou >batatin’” of beset aor cwngs sist ais? nde ynaumes mast ry daiweayert. i a | rv 38 CJUOMS FOMATSI2SR SMT, Rowen iat eran 02 8S eemotane ef A0 Peaienen emo ia ¥ eqgiia WOTKA ert oF rararnimcto ort 298 AB roroennes to £ sia naredty 40 Dei Gor ; veraerg wo OG 7 avatew > 5 pe ee ty) (} ih Be ning 10 48S ‘yaamaeea aA ae fae eaten a aoveoot er 76 aiagarid ern (ita i Heol hth no aredratt OF i Bek a = ‘ nl oe = nS’ widiness”. lant gaisiqmosaat + can idiot ett eevig Nett torial Page 22 GegurarHrire INSTALLATION Figure 1 WARNING: Before you install this Power Supply in a vehicle, measure the generator or alternator output vo/tage. The voltage output of the charging system MUST NOT EXCEED 16 VOLTS. MOUNTING CONSIDERATIONS It is recommended that you mount the Power Supply under the hood. Figure 1 shows several possible under-the-hood mounting locations. Choose the location that is best for your particular installation and allows adequate ventilation and protection from water spray. Mount the Power Supply as near to the vehicle battery or starter solenoid as practical. This will allow the 2-wire battery cable to be connected to either of these two points py the shortest route possible. It is preferable that you mount the Power Supply with the heat sink fins vertical to provide maximum cooling of the transistor. However, this is not mandatory. ( ) When you have decided upon the mounting position, use the Power Supply as a template and mark the four hole locations on the chassis. See Figure 2. Drill a 9/64” hole at each of these four points. #10 x 1/2" SHEET METAL SCREW 9/64" HOLE Figure 2 ( ) Refer to Figure 2 and mount the Power Supply at the prepared location. Start four #10 x 1/2’ sheet metal screws into the mounting surface; then tighten them securely, ( ) Attach the power cable connector to the connector on the chassis. Be sure the connectors are coupled firmly together. BATTERY CONNECTIONS NOTE: If the vehicle battery cables terminate in spring connectors, connect the 2-wire cable to the starter solenoid instead of the battery. Follow the directions for the specific conditions you encounter. oe ViOITAJJATSMI a. y lt AEM ik RLS OP! | ant nea ab ' ei ff ia, a Pia 1hY in 2h Bie ee witer rhi - it: ff ‘ os ; . wy - iy 4 | ° ot ees ae ae Pal sh nach NNR aan ek tetas 7 H . | ioe ee “oxgdlon Wotgue, owntl * bDlonplos wahigte ortt of eltiy wl S welt dnenno i ee . vie wr we¥/0 Ationge arty ot enolzoarb ond wotlo? rad of ota # a ae ' BY ie pb oe Gegrueatexire PREPARE THE CABLE END AS SHOWN. ie TAKING CARE NOT TO CUT THE INNER WIRES, REMOVE THE OUTER INSULATION OF THE CABLE. REMOVE THE INNER INSULATION, THEN APPLY A SMALL AMOUNT OF SOLDER TO THE ENDS OF THE LEADS. CRIMP: AND 3116" SOLDER SOLDER LUG Figure 3 Connecting to Battery ( ) Route the 2-wire cable to the battery. Make sure the cable clears all moving parts and is not near the exhaust manifold. Allow sufficient cable length so the wires can be connected to the battery terminals. Then cut off the excess cable. ( )- Refer to Figure 3 and prepare the end of the 2-wire cable, { ) Remove the nut from the negative (—) battery cable clamp. Slip the terminal of the brown wire over the bolt. Then replace and tighten the nut securely. ( ) In a similar manner, connect the red wire to the positive (+) battery terminal. Tighten the nut securely. Connecting to Starter Solenoid { }) Route the 2-wire cable to the starter solenoid. Make sure the cable clears all moving parts and is not near the exhaust manifold. Allow sufficient cable length so. the brown wire will reach a good ground on the engine, and the red wire will reach the starter solenoid terminals. Then cut off the excess cable. Page 23 { ) Refer to Figure 3 and prepare the end of the 2-wire cable. ( ) Connect the brown wire to a good ground (engine block or starter mounting bolts). { ) Connect the red wire to the battery terminal of the starter solenoid. This is the terminal to which the positive (+) battery cable is connected. FUSE=— y N Ue iN iS WIRE Ne TERMINALS a, ; 1/2 AMPERE: FUSE ©, ® SMALL SPRING (DISCARD THE LONG SPRING) HOOK-TY PE SOLDER LUG SS SS ene Figure 4 SWITCHING The relay in the Power Supply is energized by applying 12 volts DC to the relay coil from an external source. All power to the equipment with which the Power Supply is used as well as the power to the Power Supply is controlled by the relay. In effect, the relay is an on-off switch for the entire system. Some Heathkit Transceiver and Transmitter assembly manuals have specific information for power switching connections to the Power Supply. If you do not have specific directions on this point, use the following procedure, There are basically two ways to obtain 12 volts DC to control the relay. The first, and preferable way, is from the ignition switch. The second way is directly from the battery. Either source may be used. An in-line fuseholder, a 1/2-ampere fuse, and a hook type solder lug are supplied for this purpose. Prepare the fuseholder as shown in Figure 4. ~ ; ie ; ottw-S ortt fo Boe efit ang bas © ovegit oF teh tho % - “ = oa 4 } i | Zia Wi SiRwy, int say to lanes eettad ett ot evtw tet ort rouriiod « Peas ANT 16 MELTS ert. nolriw of inniaapat oetr at silt Didneloe, wirade ik G - Poy ae hes ED " 14 7-8D0H , yy = PIG 2 * a? ‘pir > x ! | A | if a ‘ ex ~~ ‘ ~ yidensaes astivenintl bina raviecngtT Poieitwalt emot Rieter en Seonine , ' ni . . > ' { a, ES, eget Sb. ie Gao ae : ya nigns) bnuor boog «& ot. etlw rword: eri onned A ) Artiod gnitevem ratvara » #aoid | e > basoannond sf vices yrarted (+) wvinleoa ~5cti' Rag4on = a Wea WIMT aoribibeal nivae BI gut tH 20m) Jet ot 44020 49.7 j lm | etagi PR he Si} QUINT IWS ’ : Ly = ae | , 5 St erviane bese lipid eer aah vl yaioy gift : 1) 2) eal Sel no eee wod LA sasuge ferent ancy tion wate edt'oo 00 wiav. rived ott Yo rw wild eras, bron a) zo, igaural ylqque: ewe forth: chute sttive Sn Cee eee ae. as ort’ yd bellowed al’ yl cys weseg"t ort Gs WOR ovtr as Hw ane eft. sol doflwa tone os a wre ont 30) al vale ° ry ‘ 7 i gritoriwe yawog wot 'nditeqnotni. ee overt reunion overt 70m ob voy. H. .viaqua yewo “adt: 07 znolfsanincs , gniwalle? ent “sey one it 10 neat otizeqe ; / ~~ hoe ay “ a e panies ‘abl ono fae nes. Page 24 POWER SUP PY TRANSCEIVER OR TRANSMITTER ON-OFF POWER SUPPLY BRN CABLE U 1 : EITHER ¥Y, IN-LINE FUSEHOLDER TO ACCESSORY TERMINAL OF IGNITION SWITCH OR TO POSITIVE BATTERY OR STARTER SOLENOID TERMINAL HOOK TYPE SOLDER LUG Figure 5 The switching hookup is shown in Figure 5. Connect one lead of the fuseholder to the 12-volt DC source; the other lead should be connected to either pin 6 of the 8-wire cable connector, or to the blue wire at the free end of the 8-wire cable. The relay can be energized by grounding the other side of the relay coil. This is usually accomplished by a simple SPST switch in the transceiver or transmitter with which the Power Supply is used. The brown wire at the free end of the Ga gurarHrire COLOR VOLTAGE +LV* +12 VDC GROUND GROUND —130 VDC +800 VDC RELAY RELAY *250 VDC LOW TAP 300 VDC HIGH TAP Figure 6 8-wire cable should be connected to one terminal of the switch. The other switch terminal should be connected to ground. When the switch is closed, it completes the 12 volt DC circuit for the relay coil and energizes the relay. The relay then turns on the complete system. Figure 6 shows the voltage present at each of the color-coded wires at the free end of the 8-wire cable. Connect these wires to your equipment accordingly. OVERLOAD PROTECTION lf an overload or short circuit causes;one or both of the circuit breakers to “open,’”’ the Power Supply must be turned off for approximately 30 seconds. This allows the load delay thermal switch within the circuit breaker to reset and close the circuit again. IN CASE OF DIFFICULTY This section of the Manuai is divided into two parts, The first part, titled ‘‘General Troubleshooting Information,”’ describes what to do about any difficulties that may occur right after the Power Supply is assembled. The second part, ‘‘Resistance Checks,”’ is provided to assist if the “General Information” does not clear up the problem, or if difficulties occur after the Power Supply has been in operation for some time. . * av St " | CAVORO } CHUORD oH : | pov oot ve | = : a 2GV 008+», Wate: ‘ane arent a a es YAJaF } 2 ; io it ae { : nie’ r a coer ee ot ae Sticiestteanimenea ' * anne: wag si nates aMbac wl a Pe oe BaV OUR he "JAMA SH0ZZTIDA 5 el B sigs GAT HDIHOOV OO CC ; _ fo HDtiIge weITi¥eL 10° - eis ee tn or er a - RE KASTTAD FVIT E09 OF. , a 2 / TRAIMR SE DISMTIOR SSTAATS oe oe “gas, as Fieve nim? S rata! OT betuerwins Pe] bi uoets eldeo riws : J an a ; s a 4 as: ee of Dercentrs ec } bivorte tantinnas fotiwe ycito edt Asti /3ay7 ,ODK ae : How S) arts eappiqmion MH ,besoto ai riafiver ert min Ona ss : A GIN, ms ysiey orl sesigieo bos lies pads orp tot emis OC. ao aii a marys steiqenos ert no aris nedt vehi te ae . Seer --/ ' -) $ ; 7 ss e i wey Y 2 to rose te thee sono hs 'g ab igo otiw. act to rien eget oy 3s wiw yp Pere soles - aro tae’ 2 ary ss aie onal’ Vinnibionte Fregiglupe ua of wmiiw eect ‘Hanno | wire oft jociwds. Ronee ent ot wb - sleiso owt ect te B cle willie ot batoennos od “YWoOrrsar On aA0J favo stiw-8 ant to tne ent ot ore mee oF te 5 ™ r is = art to rad 10 wid. aseuss Avot screwy beolvevo tie, 2: Ta = ed um yidaue enc att “neat of evedperd Nuss .- to ebie tartG act einai ‘niatinient ati cok eeoils atT abnogee OF yintarhixonges wot Ho betas; Tete signe ihe tems: i99 in .phepe OF 783 tow Husnio erts cirifty riothwe larmart yaieb beol = aft. toirtw- fiw witwmest yo vsieoaned ert ade . _tliega testi erty mato brs at to pare RE ERE pee | rayon 70 32a vi ees seises bi balsivewg 41 “ober? sonaminehl™ rag Daten a oat eruq owt al aaa 4. sidong eer qu tasly tint Ob “holaenoh ieeneB" are 11... “noitarmotat- . - nme and yiag ue wwot ont este 11090 saistuioltib i 1wa9e yam tartt estaba yrs thiode orig omen to aatNe ee di hua a vigque ' —t ' =) : 1° ? by Pies = 4 s Fr ; ' a .G) aecene GEN f Ly ‘ * r Lb i ’ "2. ay 4 . 4 Tae WW 6 ax : 17 c f ' 1} A bs ‘ = s ‘ ly ' 7 a 7 ae en = WMG Mee Wy axe" & » pretehia 3 hand ae ~ q be - 2 ’ ? tet “s Or ; q ua a vf ‘By J : : it Tole de a . ~ i “f ‘ . cau * a 7 , 7 4 f i] " : * Ge gueatrHrirTe Page 25 GENERAL TROUBLESHOOTING INFORMATION _ NOTE: Inan extreme case where you are unable to resolve 4 if Recheck the wiring. Trace each lead in colored pencil on the Pictorial as it is checked. It is frequently helpful to have a friend check your work. Someone who is not familiar with the unit may notice something consistently overlooked by the builder. About 90% of the kits that are returned to Heath Company for repair do not function properly due to poor connections and soldering. Therefore, many troubles can be eliminated by reheating all connections to make sure that they are soldered as described in the soldering section of the ‘’Kit Builders Guide.” Check the values of the parts. Be sure that the proper part has been wired into the circuit, as shown in the Pictorial diagrams and as called out in the wiring instructions. Check for bits of solder, wire ends, or other foreign matter which may be lodged in the wiring. If, after careful checks the trouble is still not located, check voltaged readings against those on the Schematic. NOTE: All voltage readings were taken with an 11 megohm input voltmeter. Voltages shown ~ are with no load on the output. A review of the “Circuit Description,’ and a study of the Schematic Diagram will help you locate a difficulty in the Power Supply. Check for loose hardware. difficulty, refer to the ‘Customer Service” information inside the rear cover of the Manual. Your Warranty is located inside the front cover of the Manual. RESISTANCE CHECKS 1. Resistance from terminal 1 of the power transformer to chassis ground should be 50-100 2. NOTE: This should be measured with an ohmmeter on the RX1 scale. If the reading is below 30 ohms, either Q1, or Q2, or both are shorted. Reversed meter leads should give a reading of approximately 2 Q. AD. Make forward and reverse resistance checks on diodes D1 through D7. This can be done by using an ohmmeter on the RX1 scale. In one direction the resistance will be 10 &2; reversing the leads should give a reading of infinity. If the readings vary greatly from the values given, it would indicate that the diode is either open or shorted. 3. Check the circuit breakers for continuity. Also make sure the fiber shoulder washers are properly seated in the circuit breaker bracket. 4, Disconnect one lead of filter choke L1. The resistance of the choke is approximately .6 22. 5. Use the ohmmeter to check for continuity between the various transformer windings. NOTE: The transformer leads must be disconnected for this check. Since the relay is on the on-off switch for the complete system, check its operation. Also check the circuit breakers. Repeated opening of a circuit breaker indicates an overload or short in the circuit supplied through the circuit breaker. ay ege4 6 sviows of aidanu ev vacameeas wire xe oant TOM - MOrTAMAorM ouire ot ot ‘wie \yilupittib » louteh ort 26 yeveo “ac ort bie - Jedivelé att Yo 1av05 ‘ees art ebleni batsoo! noire muta ‘soiree Whom" a yineneW Woy ‘engeirioe angaHo 35MaATZi2an eotton yam. 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Ive? rl ‘ ' eo! «as ‘ ' ee Pea ' : . fi fh oka § i my a 1 ’ i? ¢ i p a i e - } a. i ae voted id Huayo err > ai ‘pater arly sonia sno ert doerio og .obteveao eri aparia crerey2 ; tO gltego herssaeh uae eas “ss Laer hk: = loneg eel Hts! roves 4 ytinoupett @b gt .bacats a rt haw Wwoy pee nasty on drive Yelliendt awilud att yd haplootave'y STATE pa adh te tenets tata gece o¢ auis yhageng adizanut Jon ob visgey TN yoem wrelevedT joeblos. boa snoifoe dl ie gomenelery va beteniiniia ac ne Ndi 46 bereblor aw yerty Jafty ova antem of es hepenneasi ot Ye nolzoee gnivebioe ot i dina key - Edrmce -eaeceer «ire. tar ike Switching sRrequenCVe vcsncedon-eacko LE-an, Gee eutnen > GabinetioiniensiOnsiinc is scl semcsl tes lol aici mie ol olkomenine MEE VWeINt aks adialasiame oo asl letle eopbseutals grabor ue, 4: 12 to 16 volts DC (negative ground). 25 amperes maximum with full load. —10 degrees Fahrenheit to 122 degrees Fahrenheit. 800 volts DC with no load. 750 volts DC with 250 mA load. 10 UF. Less than 1% at 250 mA. Continuous up to 150 mA. 50% up to 300 mA. SSB duty up to 300 mA. 310 volts DC with no load. Less than .05% at 150 mA. Continuous up to 175 mA. 265 volts DC with no load. 250 volts DC with 150 mA load. Less than .05% at 150 mA. Continuous up to 175 mA. —130 volts DC with 20 mA load. Continuous up to 20 mA. 1500 Hz (approximate). 7-3/4" wide x 7-5/16” long x 2-3/8” deep. 5-1/4 Ibs. NOTE: A 13.6 volt DC input was used in determining electrical specifications. The Heath Company reserves the right to discontinue instruments and to change specifications at any time without incurring any obligation to incorporate new features in instruments previously sold. i, ie vs vgs? aes “BnOrTASIOSS . ds, | | tg 7 brueip ovitagen) 30 dhow of . sr anh : ./«# @ oe! a ras | . 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Bia ANOS dw 96 miovOeT~ NP ee oe aoe 1 ee eokes P ‘A268 at iy mourned Sa peng ope ee toe ae 0 eg DE Ser A ‘ = i . y .J ee | toreenixoqan) <4 doer sooea v rr ; “y * \* <7 x” -_-?F My : or : ‘ J } Sean ; oy 9 “oe ‘ 7 es pe ts af A i Pu yaad "BES xgnot “Bre x eblw “DER Ae oy * Shere, 8 : area at) ae a adi BTS: ¢ emer 7 » “ee ‘ 29 4 ad “Les -* ,, 4 Y 7 ou ) aT ony . 7 gs [Sgerearscxrry CIRCUIT DESCRIPTION Figure 7 While you read the following ‘‘Circuit Description,’’ refer to the Power Supply Schematic and Block Diagrams and to the Figures in the text to obtain a thorough understanding of the circuit operation. PRIMARY CIRCUIT The battery voltage available at the 15-terminal input-output connector of the Power Supply is applied through a 40 ampere circuit breaker to the relay contacts. When the relay is energized by external switching of 12 volts DC to the relay coil, this DC voltage is connected through the relay and through a 10-ampere circuit breaker to the filament voltage terminal of the connector. Battery voltage is also applied through suppression choke L2 to the center of the transformer primary winding. To produce the high DC voltages required to operate mobile electronic equipment, a suitable converter must be used to change battery voltage (DC) to alternating current (AC) for the necessary transformer voltage step-up action. In the Transistorized Power Supply, this conversion is accomplished with two heavy duty transistors which act as switches, and a very efficient toroid power transformer. The switching action of the transistors is similar to that ofa vibrator which uses a contact-carrying, vibrating reed to energize first one half and then the other half of the transformer primary winding. However, a vibrator is an electromechanical switch whose contacts may, after use, become burned and pitted and require replacement of the vibrator. The two transistors also alternately connect battery voltage across first one half and then the other half of the transformer primary winding. As there are no moving parts involved in this system, mechanical wear is eliminated. Transistors have extremely long life characteristics and require a minimum of maintenance. Transistor switching action is shown in Figures 7A, 7B, and 7C. The basic converter circuit is shown in Figure 8, which indicates the relative phase and amplitude of the primary and secondary voltages. When power is first applied to the primary circuit, an imbalance will exist between the two transistor circuits due primarily to slight differences in transistor and transformer winding characteristics. This imbalance causes one transistor to momentarily conduct and apply battery voltage across one section of the transformer primary winding, either section A1 or A2 depending upon which transistor is in initial control. The polarity of the base feedback voltage, with respect to the transformer primary, is such that it drives the “‘initial control” transistor into very heavy conduction; collector current is several amperes, depending upon the load on the Power Supply output. 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' c iy 59 wrosiedsZy ER ten £) a0 to nottennl eft 5a brooe pitt Wo ae o CA one? aviwosd eA ne: a a5 bee - Genes leith oie oparkelb 2 sbivowy oF vioteiee vabesid 26 708 Osle oF “grieve: & zi yiggue TAOR wits (lorie ne “aagjeo Weidved mpatiow are tot al af ‘ 2) sett seni anil frame Sone $9 setinege>. wt. At soteienet fo Ayars 9 v8 gritty weenoos oft rl eo oi an “* plusia ante ne ea get yoo nie 89 i: tf P as be y4 ‘ Ae syrt 4 rhage steal Aatineg toe uaa ae ae “igen than a RY mentors re - gewiht s eeu oe . #6 pepe we onto ae rt ae 4 MOET R ar oe ¥ Be er (SRM oar ee _ dt 90 bre 8G tlboib 1 a wes eto sense euieyy wpa seinen rabcd wl thiw, OTD bane 89 {89 sievieenee eS 23 grat touch whe ; betiuper boliqas nests él ftoietw ; sa hanes . ug PTL a take. al tne ora rateld 2 wrerad awit i tt yoibustont r108 The low voltage secondary winding is tapped to providea Bias Section choice of two different output voltages. Either the blue-green or the blue-yellow transformer lead may be The bias voltage section uses diode D7 as a half-wave connected to the voltage-doubler circuit. The blue-green lead _ rectifier. The filter network consists of capacitors C11A and provides the higher output voltage. The choice of output C11B with resistor R8. Resistor RQ is a bleeder resistor. voltages depends on the requirements of the equipment with which the Power Supply is used. CHASSIS PHOTOGRAPH POWER 40A 10A PLUG CIRCUIT CIRCUIT BREAKER BREAKER C13 R¢ R7 RELAY C12 D8 R6 Q2 L1 LZ - ‘er ovaw-Hari .6 “a re eboib aoe rentoaz apesion ‘gald offF one ATTO eretinsqes to sielanso #Owten vast? ait vettitosy ‘otelet webesic 4 ¢l-OF-soseiee?t BF) nataine’ ariw BIT az ok he eey, ry a eg 1 A ; ; | HIARDOTOMS ZIZSAHO - “aor. 2 Aa . TIUSAIO TIVOAT ASMABAG ABZAATHS | OF 3 . af ‘ ; ~% . = 7 . s ey : i Le 3 ? } ; i 7 ae ie) + —— oo “4 bos Base £55 > Trae oe ior Page 31 X-RAY VIEW NOTE: To identify a part shown in one of these Views, so 22. Locate the same identification number (next to the part) on the Schematic. The ‘’Description”’ you can order a replacement, proceed as follows: of the part (for example: 22 kQ, .05 uF, or ie Note the identification number of the part 2N2712) will also appear near the part. (R-number, C-number, etc.). 3. Look up this Description in the Parts List. SS os Pelee Ruarcomnt SNS cures e Contests Sine SNS . ee OS (Shown from component side) ré egs4 of Ten) wedmon nowedtiineb! smet ert etsoot “nolegtoreO™ off ‘oiamnerse aft? no (r6q efit “0 wu 80. S24 SS ralqnexe yo?) ‘Nag ont to ring ott wert 1esqqe Fin iw (SFSSUS ret) axe acts nl nolgiwecO sir gu Hoot “ 4 Soe WEIN VARIG 12 VDC INPUT DC TO AC CONVERTER HIGH VOL TAGE RECTIFIER HIGH VOLTAGE FILTER LOW VOLTAGE RECTIFIER LOW VOL TAGE FILTER TRANSFORMER BIAS BIAS FILTER RECTIFIER BLOCK DIAGRAM SCHEMATIC OF THE HEATHKIT® TRANSISTORIZED DC POWER SUPPLY MODEL HP-13B HIGH VOLTAGE DC OUTPUT LOW VOLTAGE DC OUTPUT BIAS OUTPUT a a i ca al ee i "y : ve >i « Re ; - Ny ¥ ‘ i a aay <2 ; = p % 4 : a7 F x } al “i , ' ' ; 1 f =z ; r ; ) . : : ail b= 2 ; P b t ry ; 3HT YW SITAMSH LE | f | : e q ' *-r( pH TASH 2 | | , AIsIMOTZI@HART - 2 ot ite ve! ¥ aque RSWOF OG. ae ! ge7-9H JAGOM cr Vy a ’ _ P ‘ | z , - ABD 1-4) + Tile ‘ on SS : *, ‘| et ee ae ee = oo + neg eg aE ye ce i AR i wl - 1 m1 ie? l & t (r= ; a 7 ‘i ; ; {FAT way JON OUGr (eae « Tie 4ay, HOt 3d WOHEs rn on intl . “ar rise2aa Htiw Nov $6 VAR YAR oh de da at wis! ae YATiUIRID DI2I9292 IBY WOTL GaLeHISaD . Med te red os” pT E Se vidal paRy ASMNIUDE IT 30 iis ote ae fh ~, : 4 a ry Hee _ pit Assembly TABLE OF CONTENTS and ) ARICA cudkc Gnieond cto cae Bmoleteoha oitec 2 Operation Fare Lint MEDC tO-AG) convert, provider, « high 2 of the esate. tes <= Eaeeiier MPEG. hey ihe lod riley ape ir [9 Gable“Preparation’:= «1. ©. eet cats see 18 TRANSISTORIZED Rraitial [LeStS mena eee eto telat 36 asks i sata ls sia coo 20 DC POWER SUPPLY RinaliAssemblVirs ee ccs os Wee me ct me 21 MODEL HP-13B Installation meme mmm tem CMR etn eCn oe cy tom rietel Uiite 22 in Case OnDitticulty= ot cts woe tes Gees eet eo 24 Heyes s2o8b bs motsadca ddénavo 4 27 GircuitiDescriptionin men vilvititl 40 ee8d ral | tse + an e's RODCORizeaa ee n.' Hotbars. | to = ign oto eieeadt> oihwe eee) ee on ron (ages war? quo pio), _ pinned PTOvoOD Ino? Wiens. uc kL au, rie Yer WVOO 1697 abian! ee ee selva? eon €3 y rer eS pct lie , 4 oe +t ' of A ie tae — aes | eH OHO. vaIERGAEM ag ’ jun SEO! g .- caster gto voiserd tunis . r | ed t . 21) varleaw telt waeore. = a Gear tra wartenrd tlvors & >. 0.. ee ie a Veet SO: | " yaler OwST ; ‘Sorkeow =, ators nolges equa iy : 0: yerkewaloo! OFF i... , 2S #t0 ; oxoo til2 t a0, gi yebiow OFS, % aant gre rormcionst wo, ' 5 2UDSH ALIS IBM E thaod Tcl ! Sv-ae ; eblos egy? Apo - i tae © oa , : : wbios bod GND =. 8 GSaas - 04 efumme?r — UY ei ty abwodtivenid ~ @ Sey st 60 oul sebics “StS ¢ AS-faS ie He. vio toqoennogs wide gs. °° $boe a5 be as Aol as a0 Hew aioe i $-ARE 20. grivesk agra! r OnE side wiws.. ft. EINhE qtrdsa miwB SAYA. af. srt anpceve S$)! er.tSe or. en f eee atirty has eulS t PE-TOE * tedat noted itaady * moe wets OT OS-5 88 etiuD sebum. . ft " age-tee 60.5 mOveo trent ae2) laurel if a ee {tecienua, ree 20% } "€ lanoliGnd) whiok BESS sable do vitor at sot betaine od mes (fame anys ; * st Hoots SeB mont ascadowg na yine Yidqs esaliq evoda off f bbA naitsaitesh, A.2.U o of a inemaide etatiw yneqmed J: a mot gnivabye nerw evi oft o8 (emeo GS mivindnimy eOT ‘sgeteog .xat aslag Iex0l Yevod of nerneD sindwoal? rile oe solves brie ag AA) ont eisieryO .geitbred ae sostten fiw ne sxuée sisitseoM leno! wow’ moth eltintiayy, 4 to sate. bone: ae at cient | GaegruearHKire (‘~ Blue lead to the circuit board pin marked BLUE (S-1). (T 6" gray lead to the circuit board pin marked BIAS (S-2). ( uy Green-yellow lead to lug 2 of transistor AE (S-1). ( “Green lead to lug 1 of resistor AH (S-2). Wrap this lead around the resistor lug. CT Carefully inspect the lugs of the resistors at CB and AH. Make sure the lugs do not touch the screws at CC and AG respectively. IMPORTANT: The low voltage output circuit has two voltage values available. The low tap output is 250 volts DC. The high tap output is 300 volts DC. Determine which of these voltages is required for the equipment with which you plan to use the Power Supply. Then proceed to the steps for the voltage value you have selected. Terminal D on the circuit board is a “dummy” terminal. (Make sure the leads are soldered to the terminals and that the terminals are soldered to the circuit board.) BLU-GRN BLU-YEL | 1} E =a BLUE/YELLOW LOW TAP © & __sewy <> facet Detall9A 4 Page 17 For 250-Voit DC Output Refer to Detail 9A for the following steps. beat (“4 Blue-yellow lead to the solder terminal marked BLUE/YELLOW LOW TAP (S-1). worn (\}"Blue-green lead to the solder terminal marked D (S-1). Proceed to ‘Cable Preparation.” |) YU Lee GS li. ie, Detail 9B For 300-Volt DC Output Refer to Detail 9B for the following steps. terminal marked (i) Blue-green lead to the solder BLUE/GRN HIGH TAP (S-1). Blue-yellow lead to the solder terminal marked D (S-1). Proceed to ‘‘Cable Preparation.” Tt eget tugiv0/00 110-088 107162) AOL bai me " aqeie « gniwaito nite xo Ale fits OF el ; aAle aisles ) nia bread stumiis ortt | sebbas att ot baal impitayoule —™) ) (t-2) TAT. WOs WO JBY\AMIE vae fe oe ~~ bewarn jariisrrve? (7-2) CO bakient animes “eon sb ot boat roam Ae uot fit gai KS) HA rian tat oinensge tt video" at beaoor 5 oS aoa ate OO te ewe ef Houa8 tin SH Agu 9 SS M4 Nisvirogaet @ owt sett fuels tuctue “egartow? woi wT ee) | nti es tena iam tiated a name 4 Tan) Lr helen cstringarr _ ‘ ‘2 \ a ss ch, car rt vi Page 20 GegurarHerre INITIAL TESTS Yo avoid possible damage, it is important that you use an ohmmeter to make the following resistance checks before you connect or turn on the Power Supply. If you cannot obtain the proper ohmmeter indication in the following steps, refer to the “In Case of Difficulty” section. DO NOT turn on the Power Supply until the difficulty has been corrected. NOTE: Use a vaccum tube voltmeter (VTVM) or a volt-ohmmeter (VOM) to make the resistance check in the following steps (solid-state ohmmeters do not furnish a voltage high enough to make the diodes conduct in the circuit being tested). Make sure you have the ohmmeter set correctly, since the range setting influences the meter reading when a diode is in the circuit. (_ ) Set the ohmmeter to the RX1 range. Because some of the circuits to be measured contain diodes, you will obtain different resistance readings if the polarity of the meter leads is reversed in the following measurements. Therefore, in the next two steps you will determine the polarity of the ohmmeter test leads and connect the proper lead to chassis ground. PICTORIAL 13 Refer to Pictorial 13 for the following steps. (_ ) Make sure the clip locks do not touch any lugs of connector BA. If necessary, bend the clip locks back slightly. (_ ) Connect the negative meter lead to the banded end of diode D2. Connect the positive meter lead to the other diode lead. If the resistance is approximately 10 ohms, connect the negative meter lead to the chassis (ground) for the following resistance checks and disregard the next step. (_ ) If the meter needle remains on or near the infinity mark (full scale), reverse the meter leads. If you now obtain a reading of approximately 10 ohms, connect the positive meter lead to the chassis (ground) for the following resistance checks. Make the resistance checks in the following chart from chassis ground to the indicated points. Some of the readings will take a few seconds to reach the specified resistance because of the slow charging rate of the capacitor in the Power Supply. 7 ————— (Cais ae see) a a + ét JAIROTII 4 Yo woul yos “uo7 Jo9t a wae gilo ert} ire oleh stood ago) qila: arty brnnd ;yueteggen Hf AG fotsennos c ; ~{yineigile © ¥ i f 1 . y J 4 x ¥ to bre bsbned ad of bach vathrn evinagen eri) remed eo ert of best rasagr eviiieog Mi trent). S02 shale arate QE yiemmixanas si eanateige§ ott V) tad) whol seestio ett ot best wiser Gvinagen iit - enw dita etuedio oonataleay oriwatkt grit wot fbrivow)-:. f nee rey “yeiniied acth won 3010. arientet estionst saters sit? » ‘won voy H 2bael rer ‘org wersver /leleoe Nat herr Fannin eno Q/ Vietamixosqqa td pribeet é chodo efit 10 {bouow) aleagrtp ecto! hee! vanes ‘svitiang ort : 2iaqdg sonaseleny OF ett tredo gniwotlot art” cote Qniwe to? ort vol CF tui var 4 o viet (4 teed re ie amy aes 4 — eteniales edui al ach ob aan alana aie etre oF © = i ate ena 0 eee eee . mained ies comntaigay beitosge edt tiveat on vom wt 4 he, Me wtp vaseen 30: aiak aed Se Pelee wiles wrt fits : or i ha ito ery 9 pet eG | 5 : hy ; Ge eo s - : rs ate a 2 ps Vest f J a r s) bie : ‘ ee i } } £ abohthey teu ; a he ; Ty Ga grmarHkire Page 21 DO THIS: THE RESISTANCE SHOULD BE: Measure terminal 1 on the transformer. 25 22 or greater. Set the ohmmeter to the RX10k range. Measure pin 3 of connector BA. 100 kQ or greater. Measure pin 15 of connector BA. 200 kQ or greater. Reverse the ohmmeter leads. Measure pin 9 of connector BA. 25 kQ or greater. Disconnect the ohmmeter leads. FINAL ASSEMBLY Refer to Pictorial 14 for the following steps. the chassis at the location shown. Be sure to refer to the numbers on this label in any communications you ( ) Install the bottom plate on the chassis. Use four #6 x have with the Heath Company about this kit. 3/8" sheet metal screws. ( ) Carefully peel away the paper backing from the blue and white identification label. Then press the label on This completes ‘‘Final Assembly.’’ Proceed to “‘Installation.”” BOTTOM PLATE BLUE AND WHITE LABEL RA he SS H SHEET METAL SCREW < iS | | PICTORIAL 14 | ap qguone SOMATREBA BHT rere 76 0 BS | yatnerg to 14 GOT . ‘'peiaiig 1 OCS etaag 10 24 Sf | yuamaeen JAVIA ~ «9 ot teler-oF ste 96 wee naiterc! ory 2 alsdewty ext hs Agere risotto? set) yo? AF adh on y gnoiracinunwnan ya nt ledel elf nd enedavan 98 : s oS, Sale tid ait? su0ds yrsqmad Areal ae fitivy qvart x 2S wut eel! siemarts ori? no eteley mom? ; : >= Vee : ee = at _ n — bas 5 « apitellatent” ot baesoyS ‘.yicmawA anlTaapaiqenom elit << Page 22 Ge gruearHxKite INSTALLATION Figure 1 WARNING: Before you install this Power Supply in a vehicle, measure the generator or alternator output voltage. The voltage output of the charging system MUST NOT EXCEED 16 VOLTS. MOUNTING CONSIDERATIONS It is recommended that you mount the Power Supply under the hood. Figure 1 shows several possible under-the-hood mounting locations. Choose the location that is best for your particular installation and allows adequate ventilation and protection from water spray. Mount the Power Supply as near to the vehicle battery or starter solenoid as practical. This will allow the 2-wire battery cable to be connected to either of these two points by the shortest route possible. It is preferable that you mount the Power Supply with the heat sink fins vertical to provide maximum cooling of the transistor. However, this is not mandatory. (_ ) When you have decided upon the mounting position, use the Power Supply as a template and mark the four hole locations on the chassis. See Figure 2. Drill a 9/64” hole at each of these four points. #10 x 1/2" SHEET METAL SCREW =- " HOLE —_— Sa = Figure 2 ( ) Refer to Figure 2 and mount the Power Supply at the prepared location. Start four #10 x 1/2’ sheet metal screws into the mounting surface; then tighten them securely. ( ) Attach the power cable connector to the connector on the chassis. Be sure the connectors are coupled firmly together. BATTERY CONNECTIONS NOTE: If the vehicle battery cables terminate in spring connectors, connect the 2-wire cable to the starter solenoid instead of the battery. Follow the directions for the specific conditions you encounter. Ber re WOITALIATEM e = EPR Se Vly Meet S10f “RANT ara ss Sad (iat 2 ee 7532 i 4 le : ve 0 oh eit A a toy ; he 2REO\Ov OD WEEE VO Note OAT oe a . . FOR Tea relator geigndity Sh No muqtus y l-a 5 } oo “i, ‘ r 7 “ 7. bation AS icchiieaianinaianes 1h. rash pny Vacpilt xd aibinamen vole Salle nea Sonugit ; 2 ae boor-ert-nbry gitiate Breve swody f pee ; jot Sued Son aaah $04 ne60e iae208' gem eg, al ae . Ri datiiaietae ie hrindnoene:~” pat act? Te YigqQu? 1e~we% art tivo Dre © etupl en wie | b a Deters rf iegern teers. "“SAT x OT to? rmsd naitsco! bere “ayy Ma civa caer netrigit not vont rihyagcnere wert: cites i je oiled eg be hah x 1 i ‘y 7 ; peti aries ett New at. : pry: ; Soleo ego ee bescrecns no. Tor eros aft OF TOPOOrnG qs yawn 6€t romthA © ye Moy Sater ite ‘ _yinivi belques me eorzanios’ efit, ome ef atewele ett - 7 anorroauog viarraa' of : > vat . erie oi gteninrae didldea. yratted einitey ae “MOqU Debio a bloneloe innete ott of Gidsy siiw-S ert TenngD aS ee ae eget S86 ae ottante re eters — Pn aad Recents aes GegruearnxKire PREPARE THE CABLE END AS SHOWN, oe Sy aes —=<) TAKING CARE NOT TO CUT THE INNER WIRES, REMOVE THE OUTER INSULATION OF THE CABLE. V, : REMOVE THE INNER INSULATION, THEN APPLY A SMALL AMOUNT OF SOLDER TO THE ENDS OF THE LEADS. CRIMP: AND R SOLDER LUG SPLOE Figure 3 Connecting to Battery (_ ) Route the 2-wire cable to the battery. Make sure the cable clears all moving parts and is not near the exhaust manifold. Allow sufficient cable length so the wires can be connected to the battery terminals. Then cut off the excess cable. ( ) Refer to Figure 3 and prepare the end of the 2-wire cable. ( ) Remove the nut from the negative (—) battery cable clamp. Slip the terminal of the brown wire over the bolt. Then replace and tighten the nut securely. ( ) In a similar manner, connect the red wire to the positive (+) battery terminal. Tighten the nut securely. Connecting to Starter Solenoid ( ) Route the 2-wire cable to the starter solenoid. Make sure the cable clears all moving parts and is not near the exhaust manifold. Allow sufficient cable length so the brown wire will reach a good ground on the engine, and the red wire will reach the starter solenoid terminals. Then cut off the excess cable. Page 23 (_ ) Refer to Figure 3 and prepare the end of the 2-wire cable. (_ ) Connect the brown wire to a good ground (engine block or starter mounting bolts). ( ) Connect the red wire to the battery terminal of the starter solenoid. This is the terminal to which the positive (+) battery cable is connected. HOOK-TY PE SOLDER LUG SY ® Figure 4 SWITCHING The relay in the Power Supply is energized by applying 12 volts DC to the relay coil from an external source. All power to the equipment with which the Power Supply is used as well as the power to the Power Supply is controlled by the relay. In effect, the relay is an on-off switch for the entire system. Some Heathkit Transceiver and Transmitter assembly manuals have specific information for power switching connections to the Power Supply. If you do not have specific directions on this point, use the following procedure, There are basically two ways to obtain 12 volts DC to control the relay. The first, and preferable way, is from the ignition switch. The second way is directly from the battery. Either source may be used. An in-line fuseholder, a 1/2-ampere fuse, and a hook type solder |ug are supplied for this purpose. Prepare the fuseholder as shown in Figure 4. e084 o > ouved ari rat bra ort wma bre & “uni o ‘eteF re ) ; viens enigne) breudig bode & oF sw mind anf tobaned (4 atiod gnitnudm ‘wrens Yo stood artt to Isnleneyt ywrted ett of awh. wm ont penn Te ort doistw OF lsnicnyer erty a *tT pioneloe waren Wherenno ei sides yrottad 1+) evivizog 5 wiupiF DUIHOT We . pnivings vd ben chy rere al lem | ait A vein eft SwOG 8 beew al yiequeé vewo ert rioitw ciyiw tnemojuos are ar ert ve beliartndg a Vig@ue tewo ey o7 vewee arf 2c Baw sviins ay wi rotiwe Mowe meal Velo wt Joofe of .veley : ‘RS yiciensans vai siento? one tiie? reer) 90°QR gnidotiaa wwor “Ww? moira piticeee. over Meuner .. sven fon ob uoy vieque wwe arr of. ehabeerines Se griwollio? ont head diet irs no enone pinned : 1 = i ¢ - ¥ er vit ce = ot DG stlov ‘Sf ‘hiatdo of evew ows | we, owdt “ert mort al yew sidiiwturg bre. zeit ¢ Lychee: | Veotad eft mor? ytioeub si yew brovejperT : 6) \eblortenu® enll-nl aA Jose sd yibon | a. ‘2 ug! nl vers ap vebiorthed? web smqay4 7 7 Sie in HWA onae darriates Fie most fies yoley ets ot,.90 Btioe,.., eon? eA ea y, + QFRIW SIMAL INE FUT OF Ti8A9 ant elt MOTTALG EA? san A VISA WENT OTT areas ae " Fat. © 2643 PT. ar pcan el ai OKA S810 2. gieuw? © epi <= on som eaM rented arlt-o2, widsp-ovwad St mie Cone " phan esosncnrbng RW hea they nt re es 303 BF “3 ; ae by itis © af 7 sin Wo a be ra i pe wate Ea esi valli toda ae ia | ert seve ei METS prt Yo luitioner ert e 7 econ eahulesetng | 906 oe * vim nei sdk osama “via 8 meg Janie ar top. 2. u ual he ats A a Al oe ek ee ae terran xi a iy me pel yom Byte 28 icGte oaks: Rasa bears: aiid diamatle a f =F Page 24 TRANSCEIVER POWER SUPPLY OR TRANSMITTER POWER SUPPLY BRN CABLE == SWITCH BLU H aso sa oe af ' W EITHER ¥, IN-LINE FUSEHOLDER ON-OFF | TO ACCESSORY TERMINAL OF IGNITION SWITCH OR TO POSITIVE BATTERY OR STARTER SOLENOID TERMINAL HOOK TYPE SOLDER LUG Figure 5 The switching hookup is shown in Figure 5. Connect one lead of the fuseholder to the 12-volt DC source; the other lead should be connected to either pin 6 of the 8-wire cable connector, or to the blue wire at the free end of the 8-wire cable. The relay can be energized by grounding the other side of the relay coil. This is usually accomplished by a simple SPST switch in the transceiver or transmitter with which the Power Supply is used. The brown wire at the free end of the Ge gurarHKire COLOR VOLTAGE +LV* +12 VDC GROUND GROUND —130 VDC +800 VDC RELAY RELAY *250 VDC LOW TAP 300 VDC HIGH TAP Figure 6 8-wire cable should be connected to one terminal of the switch. The other switch terminal should be connected to ground. When the switch is closed, it completes the 12 volt DC circuit for the relay coil and energizes the relay. The relay then turns on the complete system. Figure 6 shows the voltage present at each of the color-coded wires at the free end of the 8-wire cable. Connect these wires to your equipment accordingly. OVERLOAD PROTECTION If an overload or short circuit causes:one or both of the circuit breakers to “‘open,’’ the Power Supply must be turned off for approximately 30 seconds. This allows the load delay thermal switch within the circuit breaker to reset and close the circuit again. IN CASE OF DIFFICULTY This section of the Manuai is divided into two parts. The first part, titled ‘’General Troubleshooting Information,”’ describes what to do about any difficulties that may occur right after the Power Supply is assembled. The second part, ‘‘Resistance Checks,” is provided to assist if the ‘General Information” does not clear up the problem, or if difficulties occur after the Power Supply has been in operation for some time. ad > — Be tt ate, 5a comes *) GV Sit OVvUORD GYVORD IOV CEt= 90¥. 0084,” YAJSA YAIaA TAT =e Sav oas* a awit AT HDIH DOV OOF . siuete lenionet fothwe vereo art? Aniline oy bettixatnies ed eteiqmoo s+ ,beeoto el rdadiw: oft ner ganuesp ’ - ofl oval ert? eaxigweets bre Hoo valor ent wo} fiuelia OG Umisie¢t etelqmoa off no gfrnd medi yeti of: mo oF hetosswioo ad divors sides werd RIWO" yureue | JAW ARST TAB2299 90 Or. bys Siena HO NOTLW2 BGITIMG! IO” s 7 @0 YRITTAG WVITI209 OF 5 VAMINRF? C1GHLG2 ABTAAT? mat f F a8 a OF NYT NOOK- - : , O09 WIRIOE.) th oF * aol ; e ae nit 26 tose te tray sgetiov! ‘ery awoke 6B miei? sino cviw® ott to bow pat erlt se deniw babopieigs sh Iusenn? 62: rans i omen quod ngewe onibroace dre Taupe tuOY Of eetiw poart, serra * meted! Ove aoe DO Now RT ovis oF sebioriaeu} e | oie anived srtt te é pig jit et bstoeninas od bien f ‘WOrT: 93709 4 GAQSRAVO mw ott to bom eett ot geet sutad ert? oF my : 7 4 =n > a al et Toa dicd Ww eno. gecues Huciio norte’40 beoheve me 1H .. Sea , ¥ =e aa a od Rum yiqque .wweA ery “neqo” ot metesnd tiugda ont ewotld asf 2zboose: 06 yietuminoide 1c} Ho Derr iead ros waRTW wane idting rlotie larrnert yaleb, beol age Tizio aft eeplo bree e239 . teledt OF nebiyord. y Y eto sree” tes benahe wit aldo et Gu tents tetrasob natmerotel keaned™ att 6 ni aged 2sri yiqque wae" dt wate scape acithinhtib W30 ” ae - eTAUOITAIG 30 ce ae bis Poe ar som i murat oc Yo . vane! 2. > One rete, vet IPE” ; A beidetseee af ere a : 7 , +9 yi te! } a7 i, i x *. as ' i lee elie h awe cs : 4 Las, | j Ps at" 5 . oae A uy ; Py cs Y a aA, a ees Ur ee ee ff , ’ J * i 4) ie i We RP pegs eae oe J ie Jie cae tree ‘ ik a J le “t fs 4 ive ies 7‘ i, 4 v '- - . Fy ie ‘ P i » Be co if ° oe =o” A pies : | (ee 1 tle Ke hia ~ , oii > - 7 Ge grearHxKire GENERAL TROUBLESHOOTING INFORMATION Recheck the wiring. Trace each lead in colored pencil on the Pictorial as it is checked. It is frequently helpful to have a friend check your work. Someone who is not familiar with the unit may notice something consistently overlooked by the builder. About 90% of the kits that are returned to Heath Company for repair do not function properly due to poor connections and soldering. Therefore, many troubles can be _ eliminated by _ reheating all connections to make sure that they are soldered as described in the soldering section of the ‘’Kit Builders Guide.” Check the values of the parts. Be sure that the proper part has been wired into the circuit, as shown in the Pictorial diagrams and as called out in the wiring instructions. Check for bits of solder, wire ends, or other foreign matter which may be lodged in the wiring. lf, after careful checks the trouble is still not located, check voltaged readings against those on the Schematic. NOTE: All voltage readings were taken with an 11 megohm input voltmeter. Voltages shown are with no load on the output. A review of the “Circuit Description,’” and a study of the Schematic Diagram will help you locate a difficulty in the Power Supply. Check for loose hardware. Page 25 NOTE: In an extreme case where you are unable to resolve a difficulty, refer to the ‘‘Customer Service” information inside the rear cover of the Manual. Your Warranty is located inside the front cover of the Manual. RESISTANCE CHECKS 1. Resistance from terminal 1 of the power transformer to chassis ground should be 50-100 22. NOTE: This should be measured with an ohmmeter on the RX1 scale. If the reading is below 30 ohms, either Q1, or Q2, or both are shorted. Reversed meter leads should give a reading of approximately 2 2. 2. Make forward and reverse resistance checks on diodes Di through D7. This can be done by using an ohmmeter on the RX1 scale. In one direction the resistance will be 10 2; reversing the leads should give a reading of infinity. If the readings vary greatly from the values given, it would indicate that the diode is either open or shorted. S} Check the circuit breakers for continuity. Also make sure the fiber shoulder washers are properly seated in the circuit breaker bracket. 4. Disconnect one lead of filter choke L1. The resistance of the choke is approximately .6 &. 5. Use the ohmmeter to check for continuity between the various transformer windings. NOTE: The transformer leads must be disconnected for this check. Since the relay is on the on-off switch for the complete system, check its operation. Also check the circuit breakers. Repeated opening of a circuit breaker indicates an overload or short in the circuit supplied through the circuit breaker. a ope? ie . 8 ovibeet of olduny ove uny aa dyy b2n0 snow xs ne nt STOW WOITAMAOAME € nolermetnt “Suivie? 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Am OCP ot Gu NOUN <0 nie Gielen © a ® eo . ek oo Wee Sr (EN Ayn OS -triw 39 astov OCT ~ ‘wy \¢ a ae = £2 awa yi" a, > . « “soe _ Avert Of 2f.gu evoununod ; e-3 at *- a. ae ‘se “ie ® ae * * * : (atuanixovaae} s+, GOST oe ¢ 7 oe ale wl & ; a a :+ Geet “Aieb "SAES ey ee « abi “MX c} ® » 4%. 8 atts i* : > &! we se **. te . ie alt ae ' ¢ ° i sal ' ats ; ; 5 ] i i, i) Lm TAUe ; me ; r euniinopelo at yapin ot sever ee, a <6 ‘4 r ; i ’ : oP at; i er oe i 4. 5 ia = 7 : : ; ft es ; ‘ ; a J ya a : wie! ’ : - Page 28 Ge gurarHxKire CIRCUIT DESCRIPTION Figure 7 While you read the following ‘‘Circuit Description,’’ refer to the Power Supply Schematic and Block Diagrams and to the Figures in the text to obtain a thorough understanding of the circuit operation. PRIMARY CIRCUIT The battery voltage available at the 15-terminal input-output connector of the Power Supply is applied through a 40 ampere circuit breaker to the relay contacts. When the relay is energized by external switching of 12 volts DC to the relay coil, this DC voltage is connected through the relay and through a 10-ampere circuit breaker to the filament voltage terminal of the connector. Battery voltage is also applied through suppression choke L2 to the center of the transformer primary winding. To produce the high DC voltages required to operate mobile electronic equipment, a suitable converter must be used to change battery voltage (DC) to alternating current (AC) for the necessary transformer voltage step-up action. In the Transistorized Power Supply, this conversion is accomplished with two heavy duty transistors which act as switches, and a very efficient toroid power transformer. The switching action of the transistors is similar to that ofa vibrator which uses a contact-carrying, vibrating reed to energize first one half and then the other half of the transformer primary winding. However, a vibrator is an electromechanical switch whose contacts may, after use, become burned and pitted and require replacement of the vibrator. The two transistors also alternately connect battery voltage across first one half and then the other half of the transformer primary winding. As there are no moving parts involved in this system, mechanical wear is eliminated. Transistors have extremely long life characteristics and require a minimum of maintenance. Transistor switching action is shown in Figures 7A, 7B, and 7C. The basic converter circuit is shown in Figure 8, which indicates the relative phase and amplitude of the primary and secondary voltages. When power is first applied to the primary circuit, an imbalance will exist between the two transistor circuits due primarily to slight differences in transistor and transformer winding characteristics. This imbalance causes one transistor to momentarily conduct and apply battery voltage across one section of the transformer primary winding, either section Al or A2 depending upon which transistor is in initial control. The polarity of the base feedback voltage, with respect to the transformer primary, is such that it drives the “‘initial control” transistor into very heavy conduction; collector current is several amperes, depending upon the load on the Power Supply output. Degeneration causes the other transistor to be cut off completely. _ Sy Sagal , sie oo ost -oy) SUC : HG pee! sai Qt i ree 2) nae hes | “ae? a : \ a acum | an, DAS ey . | Sa $1 ote ian by ih ; Pal 1 pe ee LF: gu Fy : a i. “ i oe } =<. : alt = sesh d =. gilts hae a. wy - 0 at 5 : Ne ag = . s f 0 4 A ay! “ iis ae ‘, a5 SMe, ae j ' = _ A osugit Z ‘ eat to mer 28108" ddusev bre bariig bre _berrtud emicied = od vey” polrgismeet # = ont : a 468 joresiv — ettt of Breanne: tae citementod . to eoibnatyetind — eeateio or ra — =} sostioy yreited nanrice visteretio cele rosline nt owt att pee dine ‘erty fo Mert wees lett ert bone Ye so te7i? soos ae Dec grivemn on ew sredé-ge Knibrky Wramhg wenden j bagenien ihe gi tear - -tagtrainvtoem meteye ait ni -buvevnl rueguezuqnl lontened-bi wv writen eign bing solteiecamerts gi prot ylenenkxa’ oval! vidtelensiT . 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N 260V 2 Sal] v | | nage Figure 8 This condition of high current flow will continue until the transformer core reaches saturation. When core saturation occurs, the rate of change of flux approaches zero. The circuit is then unable to maintain the large driving current in the base circuit of the conducting transistor, resulting in a decrease of collector current. This decrease in collector current causes a further decrease of base drive. Circuit feedback is such that continued reduction of base drive causes the conducting transistor to stop conducting (switch off), and the other transistor to begin conducting (switch on). As the primary circuitry is symmetrical, the operation of the second transistor is identical to that of the initial control transistor. The conditions are duplicated, causing resaturation of the transformer core, This rapid change in core saturation induces a square wave alternating voltage in the transformer secondary windings, in proportion to the turns ratio between the primary and secondary. The cycle will continue to repeat itself and produce the necessary high voltage AC in the transformer secondary windings. The transistors operate at a nominal switching frequency of 1500 Hz. This frequency represents a good compromise of efficiency, filtering, and operating temperatures. At higher frequencies, the time required for the transistors to switch on and off is a large portion of the operating cycle; this results in low efficiency. At lower frequencies, larger value filter capacitors would be required and a much larger transformer would be needed. The switching frequency is determined by a number of factors, including transistor circuit values, and transformer and transistor characteristics. Page 29 The transformer used in this Power Supply is a very efficient toroid type, designed to operate at a frequency of approximately 1500 Hz. The transformer will run relatively warm even under no load. This condition is normal for a transformer operated near or in a saturated condition. Transistors used in this type of switching application operate at high current during one-half of each cycle. The transistor heat which occurs is effectively dissipated by radiation from the heat sink assemblies, which are cooled by air circulating around the heat sink fins. SECONDARY CIRCUIT High Voltage Section The high voltage DC section uses a full-wave voltage-doubler circuit, consisting of diodes D1, D2, D3, and D4 with capacitors C3 and C4. A voltage-doubler circuit produces a DC output of approximately twice the peak value of the alternating voltage available at the secondary winding of the transformer. Diodes Di and D2 rectify one-half cycle of voltage, and D3 and D4 rectify the other half cycle. On alternate half cycles, capacitors C3 and C4 charge to the approximate value of the AC voltage appearing across the transformer secondary winding. The polarity is such that the DC voltages developed across these two capacitors add together; this ‘‘doubled’’ DC voltage appears between ground and the junction of D4, C3, and R3. Capacitors C3 and C4 with resistors R3 and R4 provide filtering. R3 and R4 also act as bleeder resistors to provide a discharge path for the voltage doubler capacitors when the power supply is turned off. Buffer capacitor C2 absorbs transient voltage surges that occur in the secondary winding as a result of transistor switching action in the primary circuit. Low Voltage Section The low voltage DC section also uses a_ fullwave voltage-doubler circuit, made up of diodes D5 and D6 with capacitors C8 and C10. Capacitors C8, C9, and C10 with choke L1 filter the DC output voltage, which is then applied to the Power Supply connector. 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Either the | blue-green or the blue-yellow transformer lead may be The bias voltage section uses diode D7 as a half-wave connected to the voltage-doubler circuit. The blue-green lead _ rectifier. The filter network consists of capacitors C11A and provides the higher output voltage. The choice of output €C11B withresistor R8. Resistor RQ is a bleeder resistor. voltages depends on the requirements of the equipment with which the Power Supply is used. | CHASSIS PHOTOGRAPH PLUG CIRCUIT CIRCUIT BREAKER BREAKER RELAY C12 D8 R6 Q2 L1 L2 (i i = ee payne = ay tae ny ig Teal ee sty pak ~ aoiret se io | ¥ ida be evewthad. 8 as sa. abalb ‘sinh alces aamier atid . ad - oo © ree eae oe bra Al !9 etorisegés te atziengoshowsen retlihed? mititosy beet nueng-putd voreiagy, wheel’ 2} 88 sotalzeh on ‘natal sitive BERD. | fugue te saiora . sri oer t ¥) _ HaARBOTOHA 2i22aHo. . fa, ooo TIIORID ' TIUSAID “-ngwon = aaNAgAa ABNARAB | “ah o- a +e eee ae fs Nat a te q Ty ee 7 Oink A eas 7 Net Na a 5 Page 31 X-RAY VIEW NOTE: To identify a part shown in one of these Views, so 2s Locate the same identification number (next to you can order a replacement, proceed as follows: the part) on the Schematic. The ‘’Description” of the part (for example: 22 kQ, .05 uF, or te Note the identification number of the part 2N2712) will also appear near the part. (R-number, C-number, etc.). i. Look up this Description in the Parts List. (Shown from component side) rE aged en po ines ce ea . “*- ~ _ oe eee nae a wiv YAR-X cae =a > ce hy ot preni vedemun colvesltisneb! ames setsisood | Sit Oe cag aed see flit “noitgioend” sift olemrens2 eft no (ted er Fs bis Reese | DEC ™ 10 34 BO, HSS -elqinaxe wh) ‘Keg srit:Vo : eg org reer waqge cals Hi (SP TSS me) Sa et Yo scat 4 told tw orlt al nobgiraeeO ert gu tod: ak 12 VDC INPUT DC TO AC CONVERTER HIGH VOLTAGE RECTIFIER HIGH VOLTAGE FILTER LOW VOLTAGE RECTIFIER LOW VOL TAGE FILTER TRANSFORMER BIAS BIAS FILTER RECTIFIER BLOCK DIAGRAM SCHEMATIC OF THE HEATHKIT® TRANSISTORIZED DC POWER SUPPLY MODEL HP-13B HIGH VOLTAGE DC OUTPUT LOW VOLTAGE DC OUTPUT BIAS OUTPUT 3HnT i 7 Yu i ee id nm an ~4 ~~ @' Be ¥ ee ae 1 we i . r is : oA, 3 “ ee”) ied = / a ) ’ i? wi r oY K - ' a8 n » ee , sy c ; r ba : * 5 - * ome = a) 7 vf i t, J * La » ¢ ‘a a - ? \ = + ie | =*> 4 Chen (a F , Shep cite = nA rs f ie" a Lh e | ' re \ 7 = ‘ 7 . , a x by 7 aa ' % 20 DITAMBHOS ae * eh es ®rTtRHTASH I ee sc1nOT Zi@MART ; ve oe ane Aswod OG : aor. J3Q0M . a t 4 Fi { : = - ) > , sy — | msn aa r = + sid oa Wael (ova ound a = pha ¥ noe 1 AS ay he ef f 7 ca P “4 at § : ' ~ y% e3hait2? ae. 2 io Oo +. 8 4 a ; pennant the ‘ as = en Vaid ee 2 |e ~ in ; ; 2 [soar rcs RAAT EART i } POAT ee WJ PORTION wos asenis we 0 L- pmeki i 1 eeraroas ih j nat 34 7 : : 5 a Ee | J iad =p. ' ie “a ore ; ao ae wv ‘eye ‘ele — Sern oe "7 ' ‘ yal ie eee | / AE TTL thar ah Tt eee F AS — é . Lae ‘ ' f > i noose ‘ MARDAIG ? ~ i = y ~ J 1 a | ! 5 1 ey - > 7 fi { / ba “f rs : ; ae a) aa | ‘ i a : : ‘ei od Od - P mal : , ‘ . 7, F| = oe F q ‘ far lan *é, be : y : Ly : 4 O50 " > ee eee ; Pak . MTS a as i ; ry) pe , } 7 # ; : fa. F : i¥ a) : aul th 7 Orei 5 ; Ht a ie. ee vi ; : \ 1% rs {? Vi a at Lf i ‘ yt - ae a Sa mas - wt y a an rh ' ‘ ¥ ates ¢ 1 RA, aeaL a 5 v | ' - P Ne : > F . ‘ 2 La) é ni - ‘ a Pekin. e t Mw ~ — ari fs Q|\ 417-120 BROWN C BLU-GRN HIGH TAP TERMINAL #1 €)| &) + ,OOSUF {OOLLF ACHAY, 50V On A A A W/EN/ ONY, S1STANCES IN OHMS (K=1000, M=1,000, 000). LTAGES MEASURED FROM INDICATED POINT TO CHASSIS Dd. PLUG TERMINALS VIEWED FROM INSIDE OF CHASSIS. R LETTER-NUMBER DESIGNATIONS SHOWN ON CHASSIS 3RAPHS AND CIRCUIT BOARD X-RAY VIEW. HIGH VOLTAGE DC LI BIAS VOLTAGE -130 voc |+800VDC ! fis 12 5 +i2VD0C i As yt POWER| 2/56 14 PLUG eae: a be Seni are ek 1}e447 13 { | A LAA | ite) a] | VY V | —_— | — 1d 3! a : (*%*) 40 A CIRCUIT BREAKER 4 ULF 10 A CIRCUIT BREAKER (* *) +250 V DC LOW TAP. +300 V DC HIGH TAP. (x# *) LUG #6 AND/OR LUG #7 MAY HAVE 12 VDC WITH RESPECT TO GROUND, DEPENDING UPON THE SPECIFIC CIRCUITRY AND CONNECTIONS OF THE EQUIPMENT USED WITH THE POWER SUPPLY. a : Ms Le | c 20 3D 47 ICV HOH x Re ati ’ 1a : aie? SHO! 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