This squelch circuit is placed at the input of the single receiver audio amplifier stage. Its purpose is to silence background noise. The circuit is from an 80's documentation.
We found this circuit in the Signetics integrated circuits manual from 1972. Operational...
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...