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Electronic mosquito repellent

This electronic mosquito repellent electronic project is based on the 555 timer circuit. This electronic mosquito repellent circuit generate an ultrasonic sound with a high output frequency that allows spreading mosquitoes within a wide radius . The circuit is quite simple and require few external components . The oscillation frequency is given by the value of the R1, R2 and C1 components and can be modified changing the value of components or replacing the R2 fixed resistor with a variable resistor ( potentiometer ) .
The actual oscillation frequency of this circuit is around 45 KHz ( 46.5 KHz) so you need to use a good high frequency speaker , you can use a piezo speaker .
The circuit can be powered from a 9 V DC power supply . This repellent circuit can be used for almost any animal , it works on : cats , dogs , rats . Even if you don’t hear the sound generated by device don’t worry because the high frequency is less audible by the human ear .

Electronic Circuits: 
Circuit Diagram: 
Electronic mosquito repellent using 555 timer circuit


hello.. I just wanna ask if I am going to change the frequency of the circuit how can I do it? It's stated above that I should change the values of the components r1, r2, & c1, if I would like the frequency to be 20 KHz, should the values of the said components be lower or higher?

You need to increase the value of R2 . F= 1.45/(R1+2R2)*C1

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what is the wavelength?

hi,thanks for ur nice blog gotta question,you said we could change the frecuency by replacing r2 a vr,why should we change the frecuency,should i use a 15K vr or wut?