modified 10 years ago

Field telephone to line level interface

00:35:21

This will interface a field telephone or a field switch board to a modern line level input amplifier. Adj the potentiometer for a peak output of 1.5 volts.  The zener diodes will prevent the 90 to 120 volt ac ring signal from damaging the amplifier by clamping the voltage at 3 volts.

published 10 years ago

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