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Stereo audio signal processing
Mono
In mono sets, the signal goes via the SAW filter (position 1002/1003), to the audio
demodulator part of the UOC IC 7200. The audio output on pin 48 goes to the audio
amplifier (AN7523 at position 7902).
The volume level is controlled at this IC (pin 9) by a 'VolumeMute' control line from the
microprocessor.
The audio signal from IC 7902 is then send to the speaker and headphone output panel.
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