Flood Alarm

  

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Inside:
Liquid Sensing Circuits / Sensors Detectors Circuits

Using a few bipolar transistors, this circuit acts as a flood alarm. When liquid touches the probes, leakage current biases Ql,
Flood Alarm - schematic

Q2, and Q3 (a dc-cou-pled amplifier) into conduction, which activates the relay. The contacts can be hooked into the alarm system.

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