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.
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...
This circuit is based on one of the first germanium transistors. The power comes from a solar cell...
The circuit shown is a Step-Down converter that can provide a 5 A output with 4 to 18 V inputs. The...