I know, there are already many insects, rodents, or mosquito killer were manufactured, but that is not a problem to build this one. This is just repeller circuit not mosquito or insects killer circuit, which mean you just made the insects or mosquitos fly away from your home and go to another home to get a fresh blood. 


No, you are not guilty to build this. Just build it and have fun to see the insects and mosquitos run away from your house. The circuit itself generates sound/frequency that is most insects hate to hear it. You must use a buzzer to generate the sound because your speaker couldn’t do the job.

The output from IC NE555 pin 3 connects to buzzer to generate frequency. The led were used is blinking led to changes the voltages, the changed of voltages at 5th pin NE555 switch the frequency to make insects or rodents can’t build immunity against the ultrasonic tone. You can see my layout or the original one from http://www.danyk.cz/der2_en.html

This is the layout I made.


And the components side to help attach components on the right pins.
Have fun and thank you for coming to my blog.

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