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.
Found in a 90s Popular Electronics, this circuit is based on a common CMOS component. The circuit...
This circuit appears elsewhere on our site and is widely explored for its excellent features. This...
This is one of many metal detector versions of this type found on this site. This one uses a small...