Arp 4075 schematic

Page 1

Fc CONTROL
INPUT

NON-INVERTING
INPUT

INVERTING
INPUT

cVR TRIM
(END-POINTI

CVR TRIM
(WI PER)

cvR TRIM
(END-POINT)

POSITIVE
SUPPLY

GROUND

+15V Exponential
Converter Supply Supply R3"
R29 m3 Conditioner Splitter
196K 2N3904 J; Dis 015
7 12:4 zuzene zuasos
_ Q14 NEGATIVE . A A
' 2mm SUPPLY
I BLUE m1 R32 R37 _L cw
1Ka7 I n.01uF 6K7 10K 10K muF
1-3500PFMIK 35V
R30 7 7
1w 3% _ -14v _ _
_ 39K C7 R33 CB
5, + 1DUF 10K + IOUF
35v 35v
-14v = A 1
Si al Limiter . . . .
LSCeI Shifter R24 Filter Filter Filter Filter
sex Stage 1 Stage 2 Stage 3 Stage 4
1
as
2N5iis7 ' _
®- " [1 R9 R7 [ R14 R12 [j] R13 U R18
,/ Q10 220R ZZDR 4K7 220R 4K7 220R 220R
' 2Nsoa7 [2K2] [2K2]
i_i ._. ._-i l:-
R35 R35 R5 R22 R11 R15
3K1 3K3 12K1 12K1 12K1 12KI I2K1
1% 1% 1% L 1% 1%
_ = - - 04 - as
03 2N5057 05 2N5087 , 2N5037
2N5087 ZNSOBI 2N5087 II
Bias Current ._"_r , _ ll
Gen rator "5 "
e 02 ca :24
47DDPF 4700PF 4700PF
3
4
2C 0 >-"-. OUTPUT
213 215 21D CE
R10 LMSQOON R15 : LMSBOON R20 LM3900N 13052;
22M 22M 22M

NOTES:
1. ALL RESISTORS ARE 0.25W 10% UNLESS OTHERWISE SPECIFIED
2. ALL 10UF CAPS ARE TANTALUM

3. PAIRED PNP TRANSISTORS ARE MATCHED TO AVBE< 0.5 mV
4. Q13IQ14 ARE SELECTED
5, CR1 AND CB ARE PRESENT IN LATER REVISIONS ONLY AND SHOULD BE ADDED TO EARLY UNITS
6. A 6,8V ZENER (1N754, CATHODE TO GND) REPLACES R33 IN SOME LATER REVISIONS
(08 CAN BE OMITTED IN THIS CASE)

MODIFICATIONS (DESIGN BY TIMOTHY SMITH):
7. R2, R7, R12, R17 SHOULD BE CHANGED TO 2K2 FOR IMPROVED CUT-OFF RANGE
5. CS SHOULD BE CHANGED TO A HIGH QUALITY ELECTROLYTIC

TITLE

A075 VOLTAGE CONTROLLED LOWVPASS FILTER

DESIGN av
TIMOTHY c. GILLETTE
ALAN R. PEARLMAN

ARP INSTRUMENTS, INC.
1974

ASSEMELY
7210500/ 7210501

umms
Us 4,011,455
US 33,924,199
Us 33,444,352

4075

DRAWN av

J VERGHESE

DATE
1 u-ocT-95

REV