Simple sine wave generator composed of μA741

Published:2011/7/29 2:12:00 Author:Ecco | Keyword: Simple, sine wave , generator | From:SeekIC

The chart shows a simple sine wave generator circuit. The circuit can produce the sine wave with less distortion, the oscillation frequency: According to the data presented in this chart, the oscillation frequency is about 25Hz. Changing the value of inductor L and capacitor C can change the oscillation frequency from 15Hz to 100kHz, the total harmonic distortion can be less than 0.5%, while the upper frequency limit is controlled by the operational amplifier. The potentiometer R1 can adjust the amount of positive feedback added to series resonant circuit. Oscillation condition is that resistor R1 should be equal to the inductance sum of DC resistor RL and inductor. Diode D1 is used to limit the signal voltage to prevent saturation of inductor and operational amplifier. In order to get the distortion as small as possible, the value of resistor R1 should be as low as possible, it but must be able to ensure the maintenance of oscillation.



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