FM_GENERATOR

Published:2009/7/9 4:03:00 Author:May | From:SeekIC

The internal zener on pin 15 of the 4046B supplies a stable voltage to the 3140lC op amp. This ampli-fter modulates the 4046B VCO. The amplifier gain is about 20x (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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