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Service Manual CP-785F
4-3 TDA894xJ family Stereo Audio Amplifier
The TDA8946J is a dua-channel audio power amplifier with an output power of 2 x 7W at an 8
ohm load and a 12 V supply. The circuit contains two Bridges Tied Load (BTL) amplifiers with
an all-NPN output stage and standby/mute logic. The TDA8946J comes in a 17-pin DIL power
package.
Features
Few external components
Fixed gain
Standby and mute mode
No on/off switching plops
low standby current
High supply voltage ripple rejection
Outputs short-circuit protected to ground, supply and across the load
Thermally protected
Pin description
Pin
Symbol Description
1
OUT-
negative loudspeaker terminal 1
2
GND1
ground channel 1
3
Vcc1
supply voltage channel 1
4
OUT1+
positive loudspeaker terminal 1
5
n.c.
not connected
6
IN1+
positive input1
7
n.c.
not connected
8
IN1-
negative input1
9
IN2-
negative input2
10
MODE
mode selection input
11
SVR
half supply voltage decoupling
(ripple rejection)
12
IN2+
positive input2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
MBK936
OUT1-
GND1
Vcc1
OUT1+
n.c.
IN1+
n.c.
IN1-
IN2-
MODE
SVR
IN2+
n.c
OUT2+
GND2
Vcc2
OUT2-
TDA8946J
Summary of Contents for DTE-29U1TH
Page 67: ...Service Manual CP 785F 66 7 Exploded view ...
Page 68: ...Service Manual CP 785F 67 8 PCB Layout 8 1 Main PCB ...
Page 69: ...Service Manual CP 785F 68 8 2 AV PCB ...
Page 70: ... 69 Service Manual CP 785F 9 Circuit Diagram ...
Page 71: ...NEC Corporation 7 1 SHIBA 5 CHOME MINATO KU TOKYO 108 8001 JAPAN ...