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Water control alarm using 555

Published on Jul 28 2010 // Integrated Voice circuits

Water control alarm using 555 circuits

Figure shows the water overflow indicating circuit . The core of the circuit is 555 and  along with R3, R4, C1 a multivibrator is formed . The oscillator ‘s oscillation frequency f = 1.44 / (R3 2R4) C1, icons corresponding to the frequency parameter of about 1kHz. When the water is full , A, B was short between the state , so that BG1 triggers the oscillator circuit. The oscillation signal output  drives the audio speaker Y to sound that the water has exceeded trhe limit and it overflows.