In this post we discuss about a simple electronic high frequency mosquito repellent circuit, which is supposed to drive away mosquitoes through its tuned high frequency pulses.
Introduction
Mosquitoes can be considered as one of the most irritating bugs that not only trouble us a lot but have the potentials of spreading deadly diseases. These never seem to end, the more we find ways of eliminating them the more they come.
There are plenty of methods that have been developed today for tackling this issue, take for example the electrocuting bat, the mosquito repelling creams, coils, mats etc.
All of these may look effective but have never been the ideal method of termination.However there is one more method which is though quite controversial may be considered as the most efficient ways of all, provided the results are accurately optimized.
Here we are discussing the method which probably is able to drive away the mosquitoes with the help of frequency generations. Researchers have found that bugs and insects are typically allergenic to a certain spectrum of frequency level called the ultrasound frequency.
This frequency is beyond the hearing range of the humans, but can cause a lot of uneasiness to the insects and also to animals like dogs and cats.
Though it can be debatable, there have been scientists and many folks around who have found this method pretty useful for controlling mosquitoes.One sample circuit has been presented here which has been specifically devised for generating sound at the ultra frequency levels.
Circuit Operation
The proposed electronic mosquito repeller circuit cannot be considered “the be all and the end all”, but definitely has plenty of space for experimentation.
If the settings are done impeccably, and hits the “bull’s eye”, you could be just lucky.The idea is very simple and involves below ordinary components. A couple of transistors and a couple of capacitors with some resistors is all you would need.
The circuit is configured as a astable multivibrator, the selected components set the circuit to oscillate at the intended frequency.
The slight imbalance with the symmetry (different capacitor values) of the circuit has been intentionally so that the generated waveform is symmetrical, another aspect that is important for implementing the proposed results successfully.
The frequency is outputted over a piezo electric transducer which is the best interpreters of frequencies, typically at very high levels.
The given pot should be tried at different levels and tested in a mosquito infested area, it may be further optimized until, hopefully some positive and encouraging effects are observed, meaning if you finally see the mosquitoes actually fleeing.
About the Author
I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!
Hello sir, can I use this circuit to run small 3v dc motor, with different speed like pwm??
Hi Nitin, yes you can try it in the transistor strobe light article, using the second design, not the above.
Pls can I power this circuit with 9v battery? And were you able to lay your hand on (Arun’s) same circuit?
you can try with a 9V supply, I am sorry I did not get any email from Mr. Arun regarding the concept so far…
Pls I need a circuit with two push button.if the first button is pressed the relay should open after 5min and it should remain that way even if the power is off and re-on,except the second button is pressed to changed the state of the relay to its normal state.pls help me.thanks
without power the circuit will reset, so it is difficult to create something that will continue to hold its state even without power….it will require a of thinking.
Pls can I power this circuit with 9v battery? And were you able to lay your hand on (Arun’s) same circuit?
Anyone did this do it works well?
Any body did this circuit and do it works well?
hi swagatam,
i am a farmer, and need a simple repelling device for use in agricultural equipment, so i can reduces insecticide use.
device features;
a. solar powered with rechargeable battery.
b. a multi pulse repeller, keeps changing the ultrasonic pulse it emits. prevent pests from getting used to the sound.
c. effective range: up to 5000sf.
d. ultrasonic frequency: from 13.5khz to 95khz.
e. dual speaker or more.
could you please help me with a circuit diagram?
thank you.
cia brisat
Hi Cia,
I'll try to design it and publish it soon in my blog.
I have snt u an email ( to hitman2008@….. ). Plz check it out sir.
Of course i will sir.
On searching the internet about this topic in deep, i got several verified projects based on this, one of those saying that at high frequencies , the insect will think that some sort of dragonfly is coming to catch them and will fly away from the area. I believe thz to an extend since this statement can be true. What z ur opinion about this ?
Would you mind telling me how much does the piezo buzzer costs ?
I hope it's true and you succeed with your project.
the cost of the recommended 27mm piezo element would be hardly some rupees, may be Rs.5/-
Sir,
First of all thank you very much for all your valuable supports given for my water controller project. It is working perfectly. Now i am in the middle of making multi insect repellent which can be used for repelling all types of insects, even dogs, cats etc could be repelled. Before proceeding further, let me ask you two questions:-
1). Have you heard about any insect repellent circuit which is completely functioning or any such products in market ?
2). What type or buzzer to be used for freq. upto 90 Khz ? Can an ordinary 8 ohm 0.5 W buzzer will function atleast in freq. range of 20-30 Khz ?
Expecting ur reply soon as b4.
Hi Arun,
congrats on your success!
I personally am very sceptical about this concept, according to me frequencies cannot drive away insects.
Standard speakers will not produce 90kHz, you can use piezo transducers for it.
Do let me know the results if you are actually trying out any such circuit.