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.
This circuit is as shown in a 1976 technical documentation. It can currently be assembled with any...
Equivalent transistors, like the BC548 and BC558 pair can be used in this circuit that we find in an...
This circuit, from the On Semiconductor thyristor manual, is suitable for incandescent lamps or...