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 have in the figure as a monostable a proximity switch where our body capacitance (estimated at 200...
Suggested by Siliconix in documentation from the 90s, this circuit can present gains of digitally...
This amplifier with old germanium transistors is from a 1957 documentation. The power is a few...