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UX-M55
AN7312 (IC202) : Dual recording/Playback pre-amplifier circuit with ALC
1. Terminal layout
~
14
~
1
3. Pin function
Pin No.
Symbol
1
GND
2
ALC Time Constant
3
ALC Input Ch.1
4
Output Ch.1
5
Phase Compensation Ch.1
6
N.F.B. Ch.1
7
Input Ch.1
8
Input Ch.2
9
N.F.B. Ch.2
10
Phase Compensation Ch.2
11
Output Ch.2
12
ALC Input Ch.2
13
Ripple Filter
14
Vcc
LM1876TF (IC402) : Overture audio power amplifier series
1. Terminal layout
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
2. Block diagram
STANDBY A
GND A VCC A
5
2
+
8
+IN A
AMP A
7
-IN A
-
13
+
+IN B
AMP B
12
-IN B
-
10
15
GND B VCC B
STANDBY B
1-26
2. Block diagram
Vcc
8
7
GND
I/O
-
GND
-
ALC time constant by resistance and capacitor
I
Right channel ALC input
O
Right channel output
-
Not connect
I
Right channel negative feed back input
I
Right channel signal input
I
Left channel signal input
I
Left channel negative feed back input
-
Not connect
O
Left channel output
I
Left channel ALC input
-
Ripple filter
-
Power supply
3. Pin function
Pin No.
MUTE A
9
6
3
OUT A
4
-VCC
1
OUT B
11
14
MUTE B
14
13
12
11
10
Amp.
Ripple Filter
Ch2
ALC
Amp.
Ch1
1
2
3
4
5
Function
Symbol
I/O
1
OUT B
O
B output
2
VCC A
-
A V+
3
OUT A
O
A output
4
-Vcc
-
V-
5
GND A
-
Power Terminal
6
MUTE A
-
Control
7
-IN A
I
A -input
8
+IN A
I
A +input
9
Standby A
-
Control
10
GND B
-
Power Terminal
11
MUTE B
-
Control
12
-IN B
I
B -input
13
+IN C22B
I
B +input
14
Standby B
-
Control
15
VCC B
-
B V+
9
8
6
7
Function
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