1kHz Audio Square Wave Generator Circuit

Published:2011/7/21 0:20:00 Author:Joyce | Keyword: 1kHz, Audio , Square Wave , Generator | From:SeekIC

This 1 kHz audio square wave generator is mainly composed of comparator LM324 and R2, R3, R4, C1. The circuit is as shown in the figure. Reference voltage GB / 2 at the input end feet 3 of LM324 is received through bleeder circuit R1, R2. R2, R3 constitute positive feedback, while integrating circuit R4、C1 compose negative feedback .Set the value of R2,R3 to make the following formula work out: R2 / (R2 + R3) = 0.5, and repeat frequency of the square wave is: f = 1/2R4·Cl . If C1 = 0.033 pF,R4 = 15 kΩ, the value of f should be 1kHz. Changing C1 or R4 will change the oscillation frequency.



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