Simple liquid level alarm circuit
Source: InternetPublisher:无人共我 Keywords: Alarm circuit transistor low frequency Updated: 2020/03/16
Circuit working principle: This circuit consists of two BC547 transistors (VT1 and VT2)
and two 555 timer chips ( IC 1 and IC2). Both IC1 and IC2 are connected in
multivibrator operating mode, the difference is that IC1 generates low frequency , while IC2 generates high frequency.
As a result, when the liquid level rises and short-circuits the two probes, the circuit emits a "beep" alarm
sound.
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