This is a circuit for sensing the water with made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system. This is the figure of the circuit.
This circuit is using loud buzzer. This is a simple design circuit.
Part:
R1 - 1K 1/4 W Resistor
R2 - 680 Ohm 1/4 W Resistor
D1 - 1N4001 Silicon Diode
BZ1 - 12V Buzzer
S1 - SPST Switch
SCR - 1C106B1 SCR
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