FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
LA4598
Filter Block
CPU
POWER AMPLIFIER (IC101: LA4598)
The power amplifier is a
The following table shows the pin function of IC101.
Pin No. | Terminal | In/Out | Function |
|
|
|
|
1 | Power GND | In | Ground (0 V) source |
|
|
|
|
2 | Ch1 B.S. | — | Terminal for a bootstrap capacitor |
|
|
|
|
3 | Ch1 OUT | Out | Channel 1 output |
|
|
|
|
4 | VCC | In | +9 V source |
|
|
|
|
5 | Ch1 N.F. | In | Negative feedback input |
|
|
|
|
6 | Ch1 IN | In | Channel 1 output |
|
|
|
|
7 | D.C | — | Terminal for a bootstrap capacitor |
|
|
|
|
8 | Pre GND | In | Ground (0 V) source |
|
|
|
|
9 | Stand by | In | Power control signal input. 0 V:Off, +9 V: On |
|
|
|
|
10 | Ch2 IN | In | Not used. Connected to ground (0 V) |
|
|
|
|
11 | Ch2 N.F. | In | Negative feedback input |
|
|
|
|
12 | Ch2 OUT | Out | Channel 2 output |
|
|
|
|
13 | Ch2 B.S. | — | Terminal for a bootstrap capacitor |
|
|
|
|
14 | NC | — | Not used |
|
|
|
|
— 6 —