A water leak detector circuit is designed to give early warning of floods that can be sourced from the water heaters, washing machines, swimming pools, water tanks and so forth. Leakage, temperature changes, and / or water levels at some extreme conditions can be detected by a sensing system.
In this article will explain how to make a simple water leak detector utilizing a door bell transformer. A door bell transformer produces 6-20V AC, which can be converted into DC voltage to drive a buzzer or relay based sensing system.
On the water leak detection circuit consists of three parts, namely the DC power supply, relay or buzzer drive circuit, and sensor probe.
The voltage of the AC transformer converted into DC voltage by connecting the wires on the secondary side with a bridge rectifier and then into an electrolytic capacitor that functions as a filter from the output voltage of approximately 26V DC. Power supply ready for use to supply voltage to the buzzer driver circuit.
Buzzer driving circuit on the water leak detector is a switching circuit using a general purpose NPN and PNP transistors. Water probe made from copper wire 1 inch.
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