POT R2 can be used to adjust the sensitivity.Now you can connect the points A&B on the sensor to corresponding points A&B on the circuit.Remember the wires have to be non-insulated. Arrange two single stranded wires (running parallel 2mm close to each other) on the sheet as shown in figure below. For assembling the sensor cut a 2×2 inch mica or plastic sheet.Assemble the circuit on a good quality PCB or common board.You can review them, and buy them online by clicking on this link:- 4 GREAT BOOKS TO LEARN BASIC ELECTRONICS. These books are followed by some major universities all around the world. The output of IC1 drives the speaker to produce an alarm.ĭo you need to learn more on the basics of electronics? Are you a student who is not so familiar with the practical side of electronics? If so, CircuitsToday has reviewed and listed 4 books on the basics and practical knowledge in electronics, written by world famous authors like Forrest M Mims, Charles Platt and so on. When the transistors are ON power supply is available to the IC1 which is wired as an astable multivibrator. The two transistors are wired as a switch which goes on when the base of Q1 is shorted to the positive of the supply by the rainwater falling on the sensor. The rain detector circuit is based on two transistors (Q1 & Q2) and a NE555IC (IC1). Here is a simple rain alarm circuit that produces an audible alarm when ever rain falls.
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