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Using 555 IC and piezo-electric buzzer, we can simply make this circuit. KHz range pulses were produces using this circuit. And is reproduced as sound signals by the piezo-electric buzzer.
Human’s can’t hear this frequency of sound, but it irritates mosquitoes, and it keeps mosquito away.
555 IC is connected with components to produce Astable pulses. These pulses are reproduced as sound by piezo-electric buzzer. It can be varied by resistance R3.
Variable Resistor 10KΩ