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Comparator output is connected to the attenuator control inside of IC601.
16.8.2.4. Voice detector
The output of the mic amp Pin 10 of IC601 is supplied to Pin 14 of IC601 as a control signal for
the voice detector.
16.8.2.5. Attenuator control
The attenuator control detects the setting of the volume control through Pin 25 of IC601 to
automatically adjust for changing ambient conditions.
16.9. In Use Detector Circuit
16.9.1. Function:
This circuit is designed to automatically provide on LED indication when either one's own
telephone or another telephone is connected in parallel across the line is engaged.
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