This circuit allows for FM modulation in the aforementioned wireless microphone or radio. Here, a back-to-back varactor configuration minimizes the effects of RF modulation.

In this fm modulator prototype the varactor bias was 7.5V for the best linearity but this could be different with other varactors. FM modulator circuit diagram. Advertisement. Related articles: ...

It all ads with a weak signal that tends to drift in frequency. In contrastm the transmitter schematic we present here eliminates some of those problems, using varactor diode for tuning and modulation ...