Water full alarm circuit compose of 555

Published:2011/4/25 9:54:00 Author:TaoXi | Keyword: Water full alarm | From:SeekIC

The water full alarm circuit is as shown. The core of this circuit is the multivibrator which is composed of 555 and R3、R4、C1. The oscillation frequency of this multivibrator is f=1.44/(R3+2R4)C1, frequency of the corresponding parameters is about 1kHz. When the water is full, A and B are in the short-circuit state, BG1 close and trig the oscillator start-up, pin-3 outputs the oscillation signal to drive the speaker Y, so we know the water is full.



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