RCA RTD 152

R2
470
R4
24k
R7
1K
R6
300
R1
4.7K
5
6
7
84
IC1
4558B
C2
221
VR1
10K
1
2
3
J1
3PIN
C1
102
MIC2
PHONE
MIC1
PHONE
R10
4.7K
C4
102
E5
10U\25V
E1
2.2U\25V
2
3
1
IC1
4558
R11
24k
C3
221
R9
470
E7
2.2U\25V
R8
1K
VR2
10K
E6
10U\25V
E4
2.2U\25V
E3
2.2U\25V
E2
470U\16V
R5
10k
R3
10k
MIC SCH
+12V
OK OUT
GND
- 49 -