— 9 —
FILTER BLOCK
Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the
waveforms.
POWER AMPLIFIER (IC101: LA4635)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
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1 D.C. – Terminal for a decoupling capacitor
2 IN 1 In Channel 1 input
3 Pre GND In Ground (0 V) source
4 IN 2 In Channel 2 input
5 STBY In Power control signal input. 0 V: Off, +9 V: On
6 P.P In Prevention of POP sound
7 VCC In +9 V source
8 OUT 2 Out Channel 2 output
9 N.C. – Not used
10 Power GND In Ground (0 V) source
11 N.C. – Not used
12 OUT 1 Out Channel 1 output
From DAC
To main volume
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