Clear-Com FOR-22 - Manual (Page 22)

Vitec Group Communications
FOR-22 Dual 4-Wire Interface Instruction Manual
3 - 6
SCHEMATIC FOR LEVEL DETECT PCB
Figure 3-4: Schematic for Level Detect PCB (Part No. 710571)
LEVEL DETECT PCB ASY 710571
THRESHOLD
THRESHOLD
R3 332
K
C4 .22uF
R2 23.7K
C6 .1uF
+ -
IC3B LM
358
5 6
7
+ -
IC2B LM
358
5 6
7
+ -
IC1A LM
833
3 2
1
8 4
D7 BAV99
1
2
3
VR2 100
K
3
1
2
D4 BAV99
1
2
3
C8 .1uF
R
G
2
1
3
LED2
D5 BAV99
1 2
3
C1 .47uF
D8 BAV99
1
2
3
R5 23.7K
C5 .1uF
C7 .1uF
+ -
IC3A LM
358
3 2
1
8 4
D6
BAV99
1 2
3
C3 .47uF
D3 BAV99
1 2
3
R4 47.5K
+ -
IC1B LM
833
5 6
7
R9 475
P1
1 3 5 7 9 11 13
2 4 6 8 10 12 14
+ + + + + + +
+ + + + + + +
D1 BAV99
1 2
3
R1 47.5K
R7 47.5K
R
G
2
1
3
LED1
+ -
IC2A LM
358
3 2
1
8 4
R8 475
R6 332
K
D2 BAV99
1
2
3
VR1 100K
3
1
2
C2 .22uF