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 amplifies signals from 0.5 Hz to 300 kHz. We found it in an old documentation. Equivalent...
Of course, the range of this transmitter found in a 1992 documentation is not exactly 4 km, as it...
Using a PLL this circuit can generate signals of up to 500 kHz which is basically determined by the...