R
6
5
MIC
7
10
2
8
33K
3
4
9
R
E
1
All external resistors in ohms, all capacitors in µF unless otherwise stated
Fig. 2 Functional Schematic
V =1.3 VDC
B
6
RMIC
5
4
10
RL = 1K
7
RS
- A
≈
- B
- C
3.9k
CS
0.22
RE
8
0.015
3
9
1
10
2
50K
2.7K
R1
50K
47
0.033
RGT
RVC
All resistors in ohms, all capacitors in µF unless otherwise stated
RL
RGT
RVC
Gain of Stage A = 20 Log
(
)
Gain of Stage B = 20 Log
(
10
)
Gain of Stage C = 20 Log
(
)
10
10
RS
RE //47
R1
Fig. 3 Typical Hearing Aid Application
500 - 61 - 12
3