1kHz Audio square wave generator

Published:2011/4/20 5:50:00 Author:Ecco | Keyword: 1kHz, Audio , square wave, generator | From:SeekIC

The lkHz left and right audio square wave generator is mainly composed of the comparator LM324 and R2, R3, R4 and Cl, the circuit is shown as the chart. The reference voltage GB / 2 on input end of pin 3 of LM324 is got by the voltage divider circuit Rl, R2. The R2 and R3 constitute positive feedback, integral circuit R4 and Cl constitute negative feedback. First taking the value of R2 and R3 make R2 / (R2 + R3) = 0.5, then the square wave repetition frequency f = 1/2R4 · Cl, if selecting Cl = 0.033pF, R4 = 15kΩ, the substituted f = lkHz. Changing Cl or R4 can change the oscillation frequency.



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