The square-wave generator circuit with variable pulse width

Published:2011/10/31 2:06:00 Author:May | Keyword: square-wave generator , variable pulse width | From:SeekIC

The circuit uses theswitch Sto change the output pulse frequency range (20HZ ~ 20KHZ). Potentiometer RP1, rP2 are not only used for changing frequency, also can used to change pulse width. If changing RP2, RP1at the same time, it will only change frequency, the pulse width approximate remains unchanged. If only changing one potentiometer, it can form asymmetric positive or negative square wave signal. Diagram (b) shows a typical wave. If the circuitbetween A, B, C in the diagram is replaced by diagram (C) , it can use RP1 to change duty ratio, use RP2 to change frequency. Here RP1 chooses >1MΩ, RP2 chooses 1MΩ, then it can get positive and negative sharp pulse output in low frequency.



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