Uploaded May 2021 | Updated September 2026, 3 weeks ago

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This device is an electronic repellent to repel mosquitoes and other annoying bugs. The operating principle is very simple, through a transistor it generates a sound of about 4KHz.. sound that will annoy and scare off different bugs, the emitted frequency, in the form of sound, can be adjusted by a 500K trimmer. This circuit work between 3.7v and 5v DC.

► PROS and CONS of this circuit:
🟢 PROS: Easy to build, few components, portable, no pollute, no harm
🔴 CONS: Annoying noise even for people.

Components:
- 1x BC547 (or 2N2222)
- 1x 500KΩ Trimmer
- 1x 10KΩ Resistor
- 1x 2.2KΩ Resistor
- 1x 1nF to 10nF Polyester Capacitor
- 1x 10nF to 100nF Polyester Capacitor
- 1x Passive Buzzer
- 1x LED (any color)

Chapters:
0:00 - Intro
0:33 - Explanation
1:25 - TEST
1:50 - Oscilloscope
2:10 - Circuit Diagram
2:15 - END


WARNING: This video is only for demonstration. I don't take any responsibility.

#Mosquito #Repellent #diyprojects