Arp 4075 voltage controlled filter

Page 1

9 HM OUTPUT
cs

+15v Exponential
Converter SuPply SUpp!y Rall
R29 013 J- Conditioner Splitter
196K 2113904
_ = C15 016
1 A RED 133; 2N3905 2N3906
Fc CONTROL 014 NEGATIVE . l , .
INPUT 2113903 SUPPLY J-
R23 BLUE R31 R32 R37 (:10
11017 0,01UF 4K7 10K 10K + 10u1=
+3500FFMIK R30 35v
1w 3% _ _ -14v = _
- - 39K (:7 R33 ca
+ 10m: 10m:
+15v T 35v 10K T 35v
3' . . -14v : T ,
L'gnal' 'S-L'F'f'tge' R24 Filter Filter Filter Filter
ve I r
56K
NON-INVERnNs 1 Stage 1 Stage 2 Stage 3 Stage 4
INPUT
as
2115057
'NVERTING ®_ R3 I] R2 [] R4 [] R9 R7 I] R0 [I R14 R12 I] R13 I] R19 R17 R18
mm" 010 220R 4K7 220R 220R 4K7 220R 220R 4K7 220R 220R 4K7 220R
1N5087 IZKZI r_ fl [2K1] fl r_| [2K2] r_| r_ l2K2]
r_r |_I r_r r_r r_r r_r :I-
R35 R1 R21 R6 R22 R11 R23 R16
3K3 12K1 12K1 12K1 um um 121(1 121(1
1% 1% 1% 1% 1% 1% 1%
= _ oz 04 as as
01% 1N5087 03 2115057 05 2115037 07 1N5087
_ 2115037 2115017 2115037 2115037
3135 Current 4H7 4H7 4H7 4H7
Generator +1v c1 c2 c3 c4
= 4700le 47ODPF 47001» 4700PF
R26 6 14 3 _ 11 a
15K 5 3 4 10
1 2 + 12 13
21A 215 21c Z1D
CVR TRIM 7
(END-POINT) 012 R5 LM3900N R10 LM3900N R15 LM390011 R20 LM390011 13;;
2mg 22M .14v 22M 22M 22M
cvR TRIM
(WIPER)
CVR TRIM
(END-POINT) 69-
+15v
A
POSITIVE ,
SUPPLY @ El
R34
100R =+ cg NOTES:
1ouF 1. ALL RESISTORS ARE 0.25w 10% UNLESS OTHERWISE SPECIFIED
GROUND ® 7 35V 2. ALL 10UF CAPS ARE TANTALUM
3. PAIRED PNP TRANSISTORS ARE MATCHED AND THERMALLY COUPLED

4t Q13IQ14 ARE SELECTED AND THERMALLY COUPLED

5 CR1 AND 08 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

(C8 MAY BE OMITTED IN THIS CASE)

MODIFICATIONS (DESIGN BY TIMOTHY SMITH):

72 R2, R7, R12, R17 SHOULD BE CHANGED TO 2K2 FOR IMPROVED CUT-OFF RANGE

8. 06 SHOULD BE CHANGED TO A HIGH QUALITY ELECTROLYTIC

4075

LE
4075 VOLTAGE CONTROLLED LOW-PASS FILTER

DESIGN av

TIMOTHY C. GILLETTE
ALAN R. PEARLMAN

ASSEMBLY
7210500I 7210501

PATENTS

US «4.01 1.466
ASLINSTRUMENTS. INC. us 32
us «3.444.352
DRAWN 511 DATE REV
J VERGHESE 1o-oCT-9s E