GC509 Datasheet, PDF (3/4 Pages) Gennum Corporation – Class A Amplifier with 3 Independent Gain Blocks

5 ^RMIC
BASE CURRENT
COMPENSATION
4
2
10
9
33K
3
Fig. 2 Functional Schematic
6
21K
7
8
R_E
1
R_MIC
6
1.0
5
-A
-B
R_S = 3.9K
C_S
4
0.22
100K
R_GT
2
5.6K
3
100K
R_VC
VB = 1.3 VDC
21K
-C
7
10 9
8
R_E
1
0.1
ED1913
R_LAC
120
All resistors in ohms, all capacitors in Farads unless otherwise stated.
R_GT
Gain of stage A = 20 Log ₁₀
R_S
R_VC
Gain of stage B = 20 Log ₁₀
5.6K
Fig. 3 Typical Hearing Aid Circuit
R_LAC//21K
Gain of stage C = 20 Log _{10 RE/120}
3
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