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