Fm Generator

Posted on Dec 6, 2012

The internal zener on pin 15 of the 4046B supplies a stable voltage to the 3140IC op amp. This amplifier modulates the 4046B V

Fm Generator
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CO. The amplifier gain is about 20 (26 dB voltage). The VCO produces a 220-kHz carrier that is FM modulated. C3 can be changed to vary this frequency.

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