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.
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This Linear Technology cold cathode fluorescent circuit operates on power from 4.5 V. The...