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.
The circuit show and simulated in the MultiSIM BLUE is a high pass filter using a 741 operational...
The simplest flip-flop can be built with two NAND gates as shown here. This is a Reset-Set [S-R]...
August 2016 - It can be obtained from Mouser Electronics the battery protectors series bq7790x of...