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.
We found this switching circuit in a technical documentation from National Semiconductor. The...
This CMOS logic-based circuit was found in the April 1974 issue of Radio Electronics magazine. The circuit...
We found this circuit in a 1974 documentation. The NPN transistor can be the BD135 and the PNP the...