This circuit is from a 1984 magazine, but it can be assembled with a BC558 for TR1, BC548 for TR2 and BD136 for TR3. The X1 buzzer can be replaced by a relay depending on the supply. Depending on the buzzer or relay, the supply can be made with 6 or 12 V. The sensor is formed by stripped wires or plates that must meet the water for triggering.
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