Audio frequency oscillator circuit diagram with adjustable frequency composed of μA741

Published:2011/8/10 4:26:00 Author:nelly | Keyword: Audio frequency oscillator, adjustable frequency | From:SeekIC

As shown in the figure, it is the audio frequency oscillator circuit with adjustable frequency. Beside using bulb control gain, the circuit also has the automatic gain control circuit which is composed of zener diodes D1, D2 and resistance R2. With the frequency's dropping, the output amplitude will increase. When the output amplitude increases to the preset value, then the zener diode turns on. So the amplifier's gain decreases, and it can avoid the amplifier saturating. R2 is used to decrease the amplitude limit of zener diode, then it can avoid excessive distortion.



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