Fm Demodulator Circuit

An LM311 comparator converts a small analog signal to a digital level for the DC4046 phase-locked loop, which is configured as a first-order FM demodulator. This demodulator works with a 50-kHz FM modulated input signal. It has applications in FM light beam receivers or in remote control applications.
Fm Demodulator Circuit - schematic

Pin 1 of IC3 can be used to squelch the receiver if it is lifted from ground; if not desired, leave it grounded.

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