Friday, August 15, 2014
Electronic mosquito repeller
Here is the schema diagram of an ultrasonic mosquito repeller.The schema is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range.The schema 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.
Notes.
* Assemble the schema on a general purpose PCB.
* The schema can be powered from 12V DC.
* The buzzer can be any general purpose piezo buzzer.
* The IC1 must be mounted on a holder.
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