Electronic Mosquito Repellent Circuit Diagram. Here is the circuit diagram of an ultrasonic mosquito repeller the circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic above 20khz range the circuit is nothing but a pll ic cmos 4047 wired as an oscillator working at 22khz a complementary symmetry amplifier consisting of four transistor is used to amplify the sound the piezo buzzer converts the output of amplifier to ultrasonic sound that can be heard by the insects. The circuit can also be tweaked to generate sound within the human listening range.
The ic possesses an oscillation frequency ranging from 670 to 680 hz. Which the signal of this circuit is determined by both resistors r2 r3 and both capacitors c1 c2. Using an uninterrupted sound frequency to repel or attract insects may actually be possible in real life.
The proposed electronic mosquito repeller circuit cannot be considered the be all and the end all but definitely has plenty of space for experimentation.
If the settings are done impeccably and hits the bull s eye you could be just lucky. Pin1 ground pin which is directly connected to the negative terminal of the battery. Then there are electronic mosquito repellents available in market which are equally efficient and relatively safer. Simple mosquito repellent circuit using transistors bistable multivibrator.
