GP509 Datasheet, PDF (3/4 Pages) List of Unclassifed Manufacturers – Class A Amplifier with 2 Independent Gain Blocks

V_MIC ⁴
3
A IN
V_B
5
R_MIC
21k
6
-A
-B
B OUT
7 _RE
R_E
1
8
A OUT B IN
2
GND
Fig. 2 Functional Schematic
V =1.3VDC
B
R_MIC
4
1.0
R_s 3k9
C_S
0.22
-A
3
100k
RVC
5
21k
-B
6
1
8
7
R_E
2
All resistors in ohms, all capacitors in farads unless otherwise stated.
ED1913
RLAC
82
Gain of Stage
A = 20 Log
10
R_VC
R_S
Gain of Stage
B = 20 Log
10
RLAC
// 21K
RE // 82
Fig. 3 Typical Hearing Aid Circuit
3
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