V
=1.3VDC
B
ED1913
6
R
MIC
R
LAC
50K
5
1.0
7
0.1
R
MPO
21K
C =0.22
s
- A
- B
4
8
2
R
3.9K
≈
S
R
1
E
56
3
100K
R
VC
All resistors in ohms, all capacitors in farads unless otherwise stated.
R
R
// 21K
VC
LAC
Gain of Stage A = 20 log
Gain of Stage B = 20 log
R
56 // R
S
E
Fig. 3 Typical Hearing Aid Application
-5
-15
-25
-35
-45
-55
-65
-75
-85
0
-2
-4
-6
-8
RMPO = 50K
RMPO = 22K
RVC = 100K
RVC = 47K
RMPO = 10K
RVC = 3.3K
-10
-12
RVC = 10K
-14
-16
-18
-20
R
MPO = 0K
RMPO = 3.3K
RVC = 22K
-80
-80
-70
-60
-50
-40
-120
-100
-60
-40
-20
INPUT (dBV)
INPUT (dBV)
Fig. 5 I/O Curves at Various R
Values
Fig. 4 I/O Curves at Various R Settings
MPO
VC
510 - 69 - 06
4
GENNUM [ GENNUM CORPORATION ]
