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.
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...
With this circuit, from a 1991 publication, it is possible to regulate the output of a symmetric source...
The frequency of this oscillator depends on the inductor and capacitors in parallel with it. In...