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HD74HC126FP (IC771) : Changer control
OE1
1
A1
2
Y1
3
OE2
4
A2
5
Y2
6
Vss
7
HD74HC126
TE
L 13942296513
M5282FP-X (IC321) : E. volume
1. Pin layout
1
2
3
4
5
3. Pin function
Pin
Symbol
No.
1
Vcc/2
2
Amp+IN
3
Amp-IN
4
Amp OUT
www
5
GND
6
NC
7
VCA IN
.
8
Vc
9
VCA OUT
10
Vcc
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Vcc
14
OE4
13
A4
12
Y4
11
OE3
10
A3
9
Y3
8
2. Block diagram
10
1
9
8
2
7
6
3
Function
Vcc/2 output for microphone amp.
Microphone amp. positive input terminal.
Microphone amp. negative input terminal.
Microphone amp. output terminal.
Ground.
x
ao
Non connection.
y
VCA input terminal.
i
VCA control terminal.
VCA output terminal.
Power supply.
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8
NJM2100M (IC821) : Operational amp
A OUT
1
A IN–
2
A IN+
3
VEE
4
NJM2904M (IC951) : Ope amp
1.Pin layout
A OUT
A -IN
A +IN
Q Q
3
6 7
1 3
GND
10
4
5
7
8
u163
.
2 9
9 4
2 8
8
VCC
7
B OUT
A
–
+
B
+ –
6
B IN–
5
B IN+
1
8
2
7
3
6
1 5
0 5
8
2 9
9 4
4
5
9
m
co
KD-LX333
9 9
+
V
B OUT
B -IN
2 8
9 9
B +IN
1-31
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