Found in an old American documentation this FM modulator makes use of a varactor diode. The circuit can be easily implemented given the small number of components used.
Found on Popular Electronics from 1970, this circuit fires a xenon lamp producing a C1-dependent...
Found in documentation from the 1980s, this highly sensitive circuit is based on the conduction by the...
This simple circuit helps to save incandescent lamps by leaving their filament slightly heated and thus...