Electronic
mosquito repeller
Here is the circuit diagram of an ultrasonic mosquito
repeller. Mosquito can be repelled by using sound frequencies in the ultrasonic
range (more than 20KHz). IC CD4047 as an
oscillator working at 22KHz. Amplify its by Transistor and piezo buzzer
converts output of amplifier to ultrasonic sound that can heard by the mosquito
and other insects.
