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 uses a triac to detect the level of a reservoir, and a sensitive SCR connected to the...
This circuit came out in the American magazine Electronics Now, in a 1993 issue. The magazine no...
This circuit is from the Analog Devices component datasheet. In it we have the way to obtain a low...