Make this Electronic Mosquito Repeller Circuit

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.

Piezo Transducer

Another Interesting Mosquito Reseller Design

Mosquitoes and other toxic insects appear to only mate at specific periods, and outside of these times the sexes are extremely hostile to one another, staying well distant from one another. It's also been proven that specifically the female are the ones that really stings.

The next thing we really have to understand is that the male mosquito (as well as other bugs) flaps its wings at a somewhat different rate than the female, which is major way these distinguish themselves.

It may be deduced from these nuggets of knowledge that if one electronically mimics the noise of a male mosquito wings, the females might flee.

The circuit depicted is a basic audio oscillator whose operating frequency may be adjusted over a large range, to be precise from around 500Hz to 10kHz.

This value can be assumed to cover the frequency range of all typical bugs. The circuit is a simple multivibrator in which RV1 changes the audio frequency.

This generates a square wave, which is delivered across the tiny crystal earpiece linked to the negative line and the Q2 collector. The impedance of crystal earpieces is quite high, although it has no effect on the circuit's performance.

This basic circuit may utilize almost any transistor, however if PNP types are employed, the battery supply must be inverted.

The capacitor values are not important. In case alternative capacitors values are tried and the frequency range is deemed to be inadequate, R1 may be modified to turn it back into the recommended range.

The current consumption is minimal (2-2mA) and fluctuates somewhat with frequency, however a PP3 battery might last a long time; after all, the device needs to be remain on for extended periods of time.

The device may be constructed in a tiny box to fit inside a coat pocket with the parts placed such that the earpiece becomes external, and all the components need to be as small as possible. It's a case of trial and error to find the correct frequency that rattles the mosquitos with highest efficieny.