+ 1 5 V

A R P I N S T R U M E N T S , I N C .

4 0 1 2 V O L T A G E C O N T R O L L E D L O W - P A S S F I L T E RT I T L E

D E S I G N B Y

D R A W N B YJ V E R G H E S E

A S S E M B L Y

D A T E R E V1 1 - F E B - 9 7 A

N O T E S :

1 . A L L R E S I S T O R S A R E 0 . 2 5 W 1 0 % U N L E S S O T H E R W I S E S P E C I F I E D2 . P A I R E D T R A N S I S T O R S A R E M A T C H E D A N D T H E R M A L L Y C O U P L E D3 . Q 4 A N D Q 5 A R E S E L E C T E D A N D T H E R M A L L Y C O U P L E D

P A T E N T S

P O S I T I V ES U P P L Y

G R O U N D

4 0 1 2

1 9 7 0

R 14 7 0 R

6

N E G A T I V ES U P P L Y

- 1 5 V

C 40 . 0 1 U F

R 24 7 0 R

C 30 . 0 1 U F

R 1 81 0 0 K

C 20 . 0 1 U F

R 41 K 8

C 10 . 0 1 U F

Q 2T Z - 8 1

Q 1T Z - 8 1

- 1 5 V

R 63 K 3 21 %

R 93 K 3 21 %

R 1 12 2 0 R

R 83 K 3 21 %

R 1 22 K 2

R 1 05 6 K

R 58 2 0 R

1

14

2

18

+ 1 5 V

+ 1 5 V

S

DG

R 3 21 0 K

36

7

4

- 1 5 V

8

1

R 2 53 0 K 11 %

7

8

C 80 . 0 1 U F

C 90 . 0 1 U F

5

N O N - I N V E R T I N GI N P U T

I N V E R T I N GI N P U T

F i l t e rL a d d e r

H i g h - I m p e d a n c eB u f f e r

L e v e l S h i f t e rA m p l i f i e r

R 34 7 0 R

S i g n a l L i m i t e rL e v e l S h i f t e r

U S # 3 , 4 7 5 , 6 2 3U S # 3 , 4 4 4 , 3 6 2

Q 1 62 N 5 1 7 2

R 3 31 5 K

C R 11 N 9 1 4

C R 21 N 9 1 4

C R 31 N 9 1 4

R 1 41 0 0 K

+ 1 5 V

R 1 32 3 K 21 %

Q 32 N 6 0 7 6

- 1 5 V

R 1 71 9 6 K1 %

11S C A L ET R I M

3F c C O N T R O LI N P U T

R 3 01 K 8 7

+ 3 5 0 0 P P M / K1 W 3 %

9F I N E T U N ET R I M

R 3 14 7 0 R

R 1 61 K

+ 1 5 V

R 1 52 2 0 K

E x p o n e n t i a lC o n v e r t e r

D

S

G

R 2 04 7 0 R

C R 41 N 9 1 4

R 2 14 7 0 R

+ 1 5 V

O U T P U TG A I NT R I M

10

R 2 21 5 K

- 1 5 V

R 2 31 5 K

2

O F F S E TT R I M

Q 1 7A D 3 9 5 8D U A L F E T

R 73 K 3 21 %

R 2 43 0 K 11 %

R 2 63 0 K 11 %

C 55 0 P F

R 1 91 0 0 K

Q 4T Z - 5 8 1

Q 5T Z - 8 1

Q 6T Z - 8 1

Q 8T Z - 8 1

Q 1 0T Z - 8 1

Q 1 2T Z - 8 1

Q 1 4T Z - 8 1

Q 7T Z - 8 1

Q 9T Z - 8 1

Q 1 1T Z - 8 1

Q 1 3T Z - 8 1

Q 1 5T Z - 8 1

Q 1 8T Z - 5 8 1

Q 1 9T Z - 5 8 1

Q 2 02 N 6 0 7 6

D i f f e r e n t i a lA m p l i f i e r

C 71 0 P F

C 1 05 0 P F

A 1L M 3 0 1 A

R 2 73 0 K 1 1 %

+ 1 5 V

- 1 5 V

C 65 0 P F

A U D I OO U T P U T

4 . A 1 I S S E L E C T E D F O R L O W O F F S E T ( S L 1 9 9 8 6 )