This circuit was found in a 1980s documentation for amateur radio. The circuit makes use of components of the era, but modern equivalents can be used.
This circuit that uses a mechanical tuning fork was found in Radio Electronics magazine from June...
In the presence of the supply voltage of a 3 to 12 V circuit, this circuit causes the LED to...
This circuit supplies a voltage of 110 V from car battery with 110 V x 100 W output. Transformer...