BEAT_FREQUENCY_AUDIO_GENERATOR

Published:2009/7/10 2:27:00 Author:May | From:SeekIC

Q1 is a fixed oscillator operating at 455 kHz. U1 is a mixer, with its own internal oscillator running at 455 kHz. FIL1 and FIL2 are Murata CSB455E filters or equivalent. D1 is a vat-actor diode (an IN4002 used as a varactor works well here). R6 controls the bias on D1. When R6 is varied, the oscillator fre-quency varies a few kHz. Audio beat note is taken, through RF filter L2 and C10, from pin 5 of U1.



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