This circuit is ideal to monitor the level of charge in 12V small batteries. This circuit gives an indication using an LED when the battery voltage falls below 9 volts. The oscillation circuit built in the above circuit that changes the frequency of the tone, and thus tone can be changed.
Until the probe is in touch with the water, this procedure replicates again and again. Thus the Q2 transistor conducts and then the flow of current through the speaker generates a buzzer sound. Whenever the rainwater comes in contact with the probe in the above circuit, then the current flows through the circuit to enable the Q1 (NPN) transistor and also Q1 transistor makes Q2 transistor (PNP) to become active. 10K and 330K resistors, BC548 and BC 558 transistors, 3V battery, 01mf capacitor, and speaker. The required components to build this circuit are probes. This circuit is used in homes to guard their washed clothes and other things that are vulnerable to rain when they stay in the home most of the time for their work. The following rain circuit is used to give an alert when it’s going to rain. DC Lighting Simple Electronic Circuit Rain Alarm A switch is connected in between wire to give a supply DC voltage to the LED bulb. The +ve terminals of the lamp are connected to the anode terminal of the battery and the –ve terminal of the battery is connected to the –ve terminal of the battery. Here, a lamp is used as a load, that has two terminals such as positive and negative. A DC supply is used for a small LED that has two terminals namely anode and cathode.
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