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.
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
We find this circuit in a manual of the 80's own used components. The circuit provides an...
This circuit is from an old publication of the 70's. It can be implemented with modern transistors like the...