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.
Fluorescent lamps in the range from 4 to 40 W can be powered on from cells or batteries. The lamp...
The suggestion for using this circuit from an old American documentation is to use small antennas...
This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a...