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4
4
5
10
- C
11
D
+
-
+
-
24k
11
0.92V
8
GC514
VB
7
C1
2µ2
C7
2µ2
C6
0µ1
R7
100k
R6
100k
15
1
14
16
2
REGULATOR
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
3
8
5
17
CURRENT
REFERENCE
2:1
COMPRESSION
CONTROL
9
12
C4
0µ1
GS3011
340
11
3
V IN
9
3k9
10
15K
RVC
C5
0µ1
R4
50k
R5 50k
R3
50k
12k
R2
50k
C3
0µ1
C2
3n9
- A
- B
13
6
2
1
7
6
R1
68k
RECTIFIER
2xVB=2.6V
RE
100
VB
RTH=
CHP
(Normally not
connected)
4
1k82
All resistors in ohms, all capacitors in farads unless otherwise stated.
MIC
+
REC
+
+
-
VOLUME
CONTROL
1
5
11
2
3
4
6
7
8
9
10
BAT
ED1913
EK3024
100
Ω
Fig. 3 Typical Hearing Instrument Assembly Diagram
Fig. 4 Characterization Circuit (used to generate typical curves)
(Equivalent RMS pink noise used as V
IN
for all frequency responses)
∞
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