Electronic mosquito insect repellent circuit using 555 IC

Mosquitoes are one of the most irritating bugs and they spread many diseases. Wide varieties of mosquito repellents are available. Here we are talking about a method which would most likely drive away the mosquitoes with the help of certain frequency generators. Researchers have found that insects are typically allergenic to a specific spectrum of frequency range called the ultrasound frequency.This is a simple circuit of ultrasonic mosquito (insect) repeller for insect control based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20 KHz) range. This insect repellent frequency is farther than the hearing range of humans, but can cause a lot of nervousness to the insects and also to animals like dogs and cats. Bug control is easy with this best insect repellent.

Circuit diagram of best mosquito control circuit

Mosquito repellent circuit

You can also buy this assembled and tested circuit from us.     

Components required

  1. Power supply (12V)
  2. Resistors (2.7kΩ x 2)
  3. Capacitors (0.01µF x 2)
  4. NE 555 timer
  5. IC Diode (1N4007)
  6. Piezo Buzzer

Working of bug repellent circuit

  • Here the 555 timer is configured in astable multivibrator mode, specifically devised for generating sound at the ultra frequency levels.
  • The frequency of this circuit is set to 25 kHz, this frequency falls in the ultrasound region and it is not audible to human beings.
  • The 1N4007 diode is used to get 50% duty cycle for the frequency generator.
  • The piezo buzzer converts the output of 555 astable to ultrasonic sound that can be heard by the insects.
  • This ultrasound frequency cause some irritations and uneasiness to the insects such as mosquitoes.  However it will not disturb you if you have installed this circuit of insect repellent for your home.

How to Design a mosquito repeller circuit

We need 25 kHz signal, so the time period will be 40µseconds.
Then Ton=Toff=20µSeconds.

use R=2.7kΩ standard.

You can also use our astable frequency calculator tool to design your own frequency.

Other 555 IC projects

You can also have the pinout of 555 timer IC from here.

65 thoughts on “Electronic mosquito insect repellent circuit using 555 IC

  1. This circuit may be able to produce ultrasonic frequency. However, it is a myth that the signal in ultrasonic frequency is able to repel mosquitoes.

    • Hi Manama,
      It is not ordinary speaker. Normal speaker couldn’t vibrate in this frequency. Please Piezo Buzzer, available in electronics components retail shops. Operation of this circuit already explained, simply 555 generates Ultrasonic sound, this frequency repel back the insects.

      • I have connected piezo plate instead of piezo buzzer and the circuit sound is not audible but how can I get to know that this circuit is generating the 25khz frequency
        Plzzz reply me

  2. Hello Jaseem
    I have tried this circuit but its generating a sound which is audible to humans and its very irritating sound.
    I have used 2.2K+560E=2760E
    what should I do??

  3. how effective cover range (in square meters) of this repeller?, and..
    to modify the cover range what should be changed?, thanks.

    • Hi may I know what specific peizo should i use. other than that all compoenets are straihght off the shelf items. can you share the circuit you used. how do u test the frequwncy of sound emitted, and can this be varied by using components of different value like resistors, caps etc. Any info detailing it will be gretly appreciated

  4. I have implemented the circuit properly.But still it can’t producing ultrasonic sound.Yes,the output is irritating but human audible.
    what should I do now??????please reply as soon as possible..Urgent.

  5. Hi !! can i ask few questions ?
    1st can i use 9v battery ? will it change the frequency if I use 9v ?
    2nd can i use any type of piezo buzzer?
    3rd how can i compute frequency ?
    4th can you email me any video of this project working ? or any informations about this

    Hope you reply THANKS !!!

  6. it is a pity designing such circuit requires some basic physics/electronic skills and i guess that is the reason for most of the misunderstanding and questioning.

  7. you won’t know the circuit is working since the audio signal is beyond human range of audibility, but you can first test your multivibrator by inserting an LED (light emitting diode) as its output before making use of the bursar.

  8. Hi ! would like to ask about a few things here
    1) can the circuit be modified to produce a 40kHz sound output? and if so what items should be replaced or add
    2) how large is the radius of effect (discarding any deflection of the ultrasound)

    Hope you reply these question of mine Thank you in advance

  9. i use this circuit .it makes 25k hz but when i on this circuit mosquto are stil moving around the circuit.it cannot repelled mosquto.

  10. salam u alikum m.jaseem
    I have some questions
    why you use 2.7K Register , and why dont use 100k , 1k , ….?
    and why you use 0.01uF ?

  11. ..sir i want to ask why is it still audible for humans,?i was making this ,and i check also the connections and it is correct but why i can stillhear the irritating sound..pls feedback..

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