This circuit diagram is a circuit of a humidity detector. The sensor consists of two sets of thin wires, each of which is closely spaced, about 2 mm. When there is raindrop falling or the air humidity is very high, the two sets of wire wires constitute the wire path, and the 6V power supply voltage is applied to the base of the transistor BG1 through the resistor R1, so that BG1 is turned on, and the voltage drop on R2 makes the thyristor SCR1 is turned on, and the alarm sends an alarm signal. The alarm can only be stopped by opening the switch K. Transistor BG1 is 2N3706, which can be replaced by domestic model 3DK9B.
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