This silencer or squelch preamp circuit was found in a documentation for radio amateurs. It completely mutes the circuit when there is no sound picked up by the microphone.
May 2017 - Mouser Electronics already has for sale the new Littelfuse SP2555NUTG diode arrays for...
To control direct current loads, under voltages between 12 and 200 V, and currents up to 3 A, we...
The zener diode determines the triggering of the circuit and R3 must be a resistor that will be...