Schematic
Heathkit IT-3121 Semiconductor Curve Tracer — Schematic
- curve tracer
- semiconductor
- heathkit
- schematic
- test equipment
Schematic
~~ N TN Ry ove - ~ ad N EE PSII A ” N\ PIAA SS A 0-200V YY) oN J @ -— R14 OFF, AER RN o-av[ JO sweEP suPPLY ___ C.D Zw ©) FO OF 4¢0 © (8 ©, B) MY) O BLK- Y, No RED = (c) (E) { ES ® O R15 (0) | (G) (s) | | (D) (e) (s) RED pu vioL / R8 100 7W oN ¢ ~ o- a1 51 ) @ 50 FB I FB I FB IK FBI FB 1) | 1W | [ Fz C Eh 6 aR < we | 0 GC 1 oh ww it 100 SLOW-BLOW | (s> “a E > E) ® | 5 ~ - < / O) = @® O E00 10M ony. LEFT { s © (E) 0) > 500 RIGHT | ~ ! R9 Pll sik- 31 1 - 3 pes N D3 ® Q2 / 22 Be ® O R18 Oo UO OU 29 2 100K 1N2071 No nezo7 240V PEAK FT123 p 1W 500 10W| | 1000 HORIZONTAL = = = of OTE: ~ : in Re 0 A WHT/GRN UJ c2 \ : (B) ! + 180 @ & * @® O ol WHT SENSITIVITY 8 IE vl ty . _ ’ 5% (E) IIASSIY. A ~ » a Ee \ | | ® rR" b . Q3 KN be “ \S Vr Y lL LL (7) [) R21 FRONT OOK REAR 120 VAC i | SE) fo D2 Na ® MPSA42 N E 1 QC N ° O02 4 10x o \ ® ® Py e VIB: i soa Go, + 165V 50/60 HZ | | 0033 1 \ NY) C4 VIOL . w__| p 0 <4 D16 RZOEL & [cy | 0 OO OO R22 a 44: ” | <5 = D4 200K E) Qa ©; RN OD O—~r—sok OC v Ut: 09K 4% 8 ©, 1N2071 R7 * N > gi 62K SW10j from | ® <3 Co) ES MPSA42 & CO Ras Io ~ ~ ® ~ . : - RED SW10 _ H rq 62K < SWEEP R12 Q R13 ORN NU > g 3 aia ( BLK 51 5% VOLTAGE 680 15K © O R24 ® 1 LA Co Woo aw 0 O—~ 500K R26 ® ~ Ed BO O O— RED - ® 2) > R25 ye R29 | NORM CAL CoO N 1M @ 50K @ ® 2 T7777 Emm LOOP Q vioL +6V “ Mo 1% AC & ® RS &) O \ R30 * R106 | id SL | oO ~ R45 RN > hy AS, posh > ® > CD : 1M 1%* 15.5V — —— |RED ® [ I \ % AP LOW VOLTAGE POWER SUPPLY Ras OK \. Ae o— A O—e 10 R104 ; ©) i Vv 1 i 2700 ® < R27 R32 BR 100K 1% 6 > I ON I & 1N4002 OM « R33 BLK : F2 ! y's ” D CF a +155V D11 4) D9 ANY 1% () I= 6% @ ® 20 : 4 | BO BL En | + R36 ils R37 = NO) x1 2 D12 D10 \ _ 7 ! 1 500 0 ey 7 (B)—(E) Q17 & 24M Ma ® °® ) 50 OUTPUT R108 -15.5V _- | D6 % % MPSA20 % 100K Pp : 4% B—> +16 ; ats 9 V V Ts VERT Pre | ¢ D8 R43 - rh i 1N4002 017 +, + 2700 AN sensitivity EK V 7 : VR-16,1G == g¢ f-24 Vv. | | ed N STEP Fad I I i RUS TOGGLE (> N FRONT REAR SELECTOR Pad I I ¢ A OO Try OO pew -7 | I | \/ € / of J NTE rem N \ 0 | 10 i Pe - 240 VAC BLK - YEL I R41 \ 1 14 ord STEPS) NE O | ® 1% 1% O/ M) 1 CURRENT res TAGE : 50/60 HZ —— mm =] —————— 3 or 08 a Qs ~~ © STEP GENERATOR hR 0 QO C I I 1N4002 56 ev] IC6 A WHT = ® @ @ (J 2 STEP | I ! arn. > F— & [esy | \/ SN7490N a R53 R54 > R55 R56 ow RANGE Baile : 1 i Vie Q14 D > 80K 40K 20K N 10K O &® oC ® 5 <> ® @® .002 : I I [CO py 1% 1% 1% \ 1% R101 R99 R86 I BLK I \ Ele a a N 10 10 500K 1% : + <\ 10K \/ k c a 5% N © 2006 1% | | 15 Q6 \ ® CO i) ® 20 O) ' 01 & A) (B) ats MPSA20 Lio Ne Re i | ©) — 5% . a, co | | jE fry gy BN ° OTEeTEE 0 © EON RE 45V 51M > i 0 ° ! SCHEMATIC OF THE Pp Ne O O°» Ea ® ® 100 An oe 05 | HEATHKIT" Ce Raz 2 1000 1% \ (2) &® O 200 2) A SEMICONDUCTOR CURVE TRACER Ras1G NE | ~ | | MODEL 1T-312: y — hi hp v 0 0—¢: | \ { I \ ; J \ 0 !' C 5 : NOTES: + Lo oo [+ 3 wo |+ 3 She + Te 5, HES +161V | gi 10K Q7 5% gas Q9 5% Gd Q10 5% £14 Qs 5% Pe ~ A I MPSA2 , : . ALL RESISTORS ARE 1/2 WATT UNLESS OTHERWISE MARKED. WV, ya © V, CO WV, 0 eo 7 SEF AMPLIFIER Ro LER | RESISTOR VALUES ARE IN OHMS (K=1,000 M=1,000,000). ot of} (1 of TX OU 2 D14 R92 I R59 R63 R67 R72 - R83 C15 1N4002 500 1% I | . ALL CAPACITOR VALUES ARE IN uF UNLESS MARKED pF. res 27K LV ros “1 \/ sees TX \x/ rz \/ PL Y 20K 71 20pF 1) O | C 5 + R93 . REFER TO THE "CHASSIS PHOTOGRAPH" AND "CIRCUIT BOARD 7 nN = § Ea | X-RAY VIEWS" FOR THE PHYSICAL LOCATION OF PARTS. JG > ONO#——C | O90 BLU : 2 7 PA (5) 062 AMP 100 1% | . $7 THIS SYMBOL INDICATES GROUND. 7 20 19% g a%3 p13 ! ! | c¥ 1N4002 pe SYMBOL INDICATES A LETTERED OR NUMBERED CIRCUIT SW8 XO seh \ wr QO ) 750 \ | | BOARD CONNECTION. YEL % Q12 C | OC & 002 Sn 15% 3 SGC5283 ; BRN | & THIS SYMBOL INDICATES A PART NOT MOUNTED ON THE MASTER +155V V ©; Y / : R84 -155V f [ . (CO THIS SYMBOL INDICATES A DC VOLTAGE TAKEN FROM THE | - { CURRENT I 10K § POINT INDICATED TO CIRCUIT BOARD GROUND WITH A AE : A 5 oR onno DETAR oll BA 4 | HIGH INPUT IMPEDANCE VOLTMATER. 0 oo / | Sars OY 1 OC) 020 y . 8 2 J CURRENT } sk THESE WAVEFORMS AND VOLTAGES WERE TAKEN WITH THE 1% | ’ O, RN << - O a CONTROLS IN THE FOLLOWING POSITIONS. ee—Q | O10 eq ROG 6 § / whT- 250 1% | WV, -15.5V WHT - GRY \ 20K 1% s J Qs ORG "ye SWEEP VOLTAGE FULLY COUNTERCLOCKWISE | ror O ' O—8 10 \ "Rs ~R SWEEP RANGE 0-40 Lr. NS 155 J 7K 2 AR POLARITY NPN I nN K / \ or r—L) [ 2 ’ / VOLT - CURRENT VOLTAGE R78 ; AY A SA BLK| VOLTAGE STEPS / FAMILY FULLY CLOCKWISE oO | O—8s &> EL , V STEP RANGE 1 VOLT / STEP R79 7 2500 1% I * / OO !' OO 1 1 VOLTISTEP Kk * | y) | yd y 1 VOLTISTEP 0 0 2 K |] TS MSEC. / 83 E) | 9 5 Rr | MSEC | / ® ® 10 y | / I / le oe oe ot —_———me————e—,—_—,—,—_,—_,—_—,—_,E—,E—_,E_,E_,E_,E_,E_,E_E_,E_E_E_E_,E_E_E_E_,E_,E_,E_,E_—_E_,E_,E_,E_,E_E_—_E_—EE_,E—_—,E_—_,E_,_—,E—_,—_,—_, .;