3845

AM NOISE BLANKER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

5

15

CC

V

SUPPLY

AUDIO OUT 1

Dwg. FS-004-1A

RF BYPASS

AUDIO IN 1

AUDIO OUT 2

AUDIO IN 2

MIXER

OUT

6

8

17

18

PEAK

DET

REG

1

4

16

3

2

20

10

12

11

9

GROUND

RF AGC

RF BIAS

RF GATE

LOW

RF IN

RF GATE

HIGH

RF

13

dV/dt DET

+4 V

IF

IN

19

14

7

NO CONNECTION

1 k

Ω

1 k

Ω

Copyright © 1988, 2000 Allegro MicroSystems, Inc.

Note that the noise-pulse input is attenuated 20 dB by the test circuit.

AUDIO IN 1

AUDIO OUT2

AUDIO IN2

0.1

0.1

0.1

0.1

0.001

C 8

SUPPLY

Dwg. ES-007-1A

RF

RF BYPASS

0.1

MIXER OUT

NOISE

+

R15

R 5

R 6

10

µF

0.1

0.005

0.01

0.01

13

14

15

16

17

19

12

18

20

11

1

2

3

8

9

4

5

6

7

10

CC

V

NC

NC

NC

DET

FUNCTIONAL BLOCK DIAGRAM

TEST CIRCUIT