Simple water level alarm circuit
Source: InternetPublisher:抄写员 Keywords: Alarm circuit multivibrator amplifier Updated: 2021/03/12
Working principle of the circuit: The square wave signal generated by the crystal oscillator in the circuit is sent into the water through the probe
. The entire circuit consists of a transistor multivibrator , amplifier and alarm circuit
. The multivibrator outputs the audio frequency from the VTz collector in the form of a square wave signal
, which
is sent via C4 to one of the two probes on the top of the tank. The other probe is connected to amplifier VT3 via c5
.
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