Simple DIY mosquito repeller

Operating principle

Manufacturers of ultrasonic repellers claim that the devices act on insects thanks to special sound frequencies. The human ear cannot detect them, but the sounds repel mosquitoes.

Interesting!

A mosquito repellent device produces sound waves similar to the flight vibrations of a dragonfly, a bat, or repeats the sounds of a male mosquito. Females pose a particular danger to humans. They feed on blood to give birth to new offspring. After fertilization, females try to avoid meeting males, so the squeak of a mosquito scares them away.

DIY insect repellers

It is not easy to calculate what kind of ultrasound a homemade device will produce, but, according to users, the design of the ultrasonic mosquito repeller is correct and effective.

Electrician in the house

Author: admin, 02 Jul 2013

Nowadays, a huge number of ultrasonic mosquito repellers in the form of keychains have appeared on the market. This keychain costs $15 and up. There is still debate about the effectiveness of these repellers. There are also mosquito killers that use light/heat/carbon dioxide to attract mosquitoes and then electrocute or otherwise kill them. I cannot judge how effective these devices are. But I propose to assemble a simple circuit with your own hands (before spending money on a keychain), based on the principle of which ultrasonic mosquito repellers are assembled, and personally test their effectiveness.

Diagram of an ultrasonic mosquito repeller.

Mosquito Repeller

The diagram shows:

• R1 - resistor MLT-0.125, 10 kOhm.
• R2 - resistor SPO-0.5, 100 kOhm.
• R3 - resistor MLT-0.125, 100 kOhm.
• C1 - capacitor KDK 3300 pF.
• VT1 - transistor MP 38.
• VT2 - transistor MP 42.
• H1 - DEM 4M capsule.
• G1 - 9 V battery type "crown"
• S1 - any switch.

The circuit is assembled on the basis of an asymmetrical multivibrator with two transistors. The generation frequency can be smoothly changed by resistor R2 and also by selecting the capacitance of capacitor C1.

Parts other than those indicated can be: resistors of any brand, the variable can be replaced with a trimmer, the capacitor can be of the types KLS, KTK, transistor VT1 - MP36, MP37, transistor VT2 - MP40, MP 41, P601. When using more powerful transistors, the range of the device increases accordingly. The battery can be made up of several batteries or even replaced with a power supply.

The principle of operation of repellers is based on ultrasound radiation, which (if the frequency is correctly selected) should (but is not obligated to) scare mosquitoes away from the sound source. There are many opinions about the nature of scaring and the required sound frequency. They write a lot - that it should be the frequency of the wings of a male mosquito, the frequency of a dragonfly (as a natural enemy of mosquitoes), the frequency of the sound of a female mosquito, just ultrasound without explanation...

There was a time when even the radio broadcast a frequency of 15 kHz, designed to repel mosquitoes. There are even programs for phones that create high-frequency sound. Some even suggest using an ultrasonic washing machine to repel mosquitoes. Along with this, the opinions of scientists are also published who claim that ultrasound has no effect on mosquitoes.

By the way, ultrasonic mosquito repeller is a somewhat inaccurate name, since ultrasound is considered to be a sound with a frequency above 20 kHz, which is not audible to the human ear. But the squeak of a mosquito and the buzz of a dragonfly are audible sounds, and the proposed repellers generate sound below ultrasound - from 2 to 15 kHz.

My personal opinion is that at the moment, chemical mosquito repellents are more reliable and effective than others.

I also read on the Internet (I don’t remember on which site) an interesting way to kill mosquitoes and other flying insects: we turn on a light bulb and put a fan under it, the insects fly into the light and are brutally killed by the fan blades).

It will be interesting to read:

Laying open wiring in the house

How to choose a welding machine

Soldering Iron Temperature Controller

Headings: Useful devices, Electronic devices Tags: do it yourself, electronics

The main qualities of a repeller

The ultrasonic mosquito repeller has the following properties:

The device is safe for people and animals;

It does not contain chemicals and elements hazardous to health;

The operation of the devices does not interfere with mobile phones, alarms and other electronic devices.

When buying a device, you should remember that:

1. The best choice is to purchase a multifunctional ultrasonic mosquito repeller. Feedback from people who have used such devices for a long time suggests that such devices can emit many different frequencies that repel different types of insects, and not just one species.

2. Not all such devices can be installed outdoors. Each of them has its own temperature range. For use in an aggressive environment, you should purchase a device that has a waterproof housing.

3. You should buy only time-tested models.

4. A high-quality and effective device will not be cheap.

An ultrasonic mosquito repeller costs on average 850-900 rubles.

The price depends on the design of the model, the set of certain functions and the region of residence of the buyer. There are devices that cost from several thousand to tens of thousands of rubles, but they can only be purchased to order.

Generator circuit for repelling rodents

• The electrical circuit of the generator includes an ultrasonic vibration generator (C3, C4, DD1.3, DD1.4, R3, R4), a low frequency modulator (C1, C4, DD1.4, R1, R2), a power amplifier using transistors VT1- VT3, emitter, which uses a high-frequency loudspeaker 4GDV-1.
• The generator emits frequency-modulated oscillations in the range of 15....40 kHz. The frequency can be adjusted by resistor R4, the modulation frequency is adjusted by resistor R2 within 2...10 Hz.
• If you set contact SB1 in such a way that in case of unauthorized entry into the room this contact closes, the generator can work like a security alarm siren, since it begins to emit frequency modulation in the range of 1000...2000 Hz.
• It is important that when working for a long time in one frequency range, rats get used to it, so you need to change the radiation parameters with resistors R2-R4 2-3 times a week. Or connect capacitor C4 to a piece of wire that creates an additional capacitance that changes with changes in temperature and humidity. Then the frequency will change randomly.

Generator circuit

Circuit example

Physicists can make a device that produces sound of a certain frequency. But using their drawings, it will be possible to make an effective device within an hour.

The electronic circuits of the ultrasonic repeller show the chain along which the components of the device should be connected.

The designations on the chip mean the following:

• R1-R5 – DC resistors with a power of 0.25 W;
• VD1 – diode to protect the device from short circuit or incorrect connection;
• BQ1 – emitter producing ultra-frequency sound;
• VT1-VT2 – bipolar transistors;
• R6 – variable resistor;
• C1-C2 – capacitors;
• S1 – toggle switch for turning on and off.

All components of the drawing are located on a printed circuit board; you will need batteries or rechargeable batteries for outdoor use. Power supply with voltage up to 12 V.

You can adjust the sound frequency using variable resistor R6. A homemade repeller is used indoors or outdoors.

You can use the K555LA3 microcircuit with good frequency characteristics and low electrical energy consumption. There are only 4 parts in the diagram.

The designations are similar. Assembled on a breadboard. The signal is generated by capacitor C1; if it needs to be changed, it is regulated using a variable resistor R6. An ultrasonic repeller can be made in a few hours with minimal knowledge of physics.

If someone is interested in whether it will work or not, you can spend a few hours of your free time making an ultrasonic repeller. But, it is much easier to buy a ready-made device at an affordable price with similar, or even better, action.

When warm days arrive, it's not only good for sunbathing lovers, but also for pesky mosquitoes, which are considered one of the oldest insect species on the planet. Their distant relatives were five centimeters long and did not give peace to the dinosaurs themselves.

Mosquitoes cannot tolerate temperature changes: they hide in frost and extreme heat. The most comfortable temperature for them is +15… +22 degrees. At this time, they become active and annoy people.

It is also known that mosquitoes do not rise high into the air, but fly above the ground. Therefore, residents of apartments located on the lower floors of residential buildings often need means of protection against these annoying insects, including a mobile ultrasonic mosquito repeller.

Which device is better to choose?

You need to choose an electronic device based on several parameters:

• desired characteristics of the emitter.
• Feeding method.
• Place of further use.
• Price policy.

Please note: sometimes the ultrasonic mosquito repeller does not have the desired effect. This is explained by the fact that different frequencies of ultrasonic vibrations are acceptable for different types of insects.

Simply put, a device that is effective in one area may be completely useless in another.

Universal models

1. Mosquito repeller "Tornado".

The device operates on mains power and batteries, and the impact radius reaches 50 square meters. m. The model has two emitters with the ability to adjust the frequency and power of ultrasonic waves.

Despite the noticeable efficiency of the device, its cost is relatively low (approximately 1.5 - 2 thousand rubles).

1. The unit is from the Chicco brand.

The repeller is stationary and is powered only from an outlet. The case has a light indication, which increases ease of use at night.

The device is designed specifically for installation in children's rooms; it is safe and ergonomic. It is allowed to place the unit next to the baby’s crib.

Advantages of repellers

A homemade repeller is easiest to assemble for radio amateurs or people who have an understanding of modern radio components. Although the simplicity of the design makes it accessible even to an inexperienced user.

Advantages of the device:

1. Duration of use. It can be used repeatedly without loss of quality.
2. Cheapness. The cost of such a device is not much different from a purchased cream, but much cheaper than buying a ready-made ultrasound device.
3. Efficiency.
4. Numerous positive reviews from users who have personally tested the repellers indicate that the device really works.
5. Mobility. When creating a device, you can immediately set its dimensions. As a result, it is possible to obtain a repeller of various sizes for mobile use.

It’s not difficult to make such a device; the most important thing is to choose the right circuit.

Possible applications

DIY mosquito repeller

A device for repelling mosquitoes works on the principle of how insects perceive various sounds. When assembling ultrasonic models, special frequency microcircuits are used. It is inaudible to humans, but extremely unpleasant for mosquitoes.

Repellers imitate sounds that are unpleasant for mosquitoes, which are similar to those of bats, male mosquitoes, and dragonflies. It is precisely such vibrations that females try to avoid, which pose the greatest danger to humans.

There are so many designs for ultrasonic repellers that they can be effectively used both outdoors and indoors. The type of power source of the mosquito repellent device plays a key role in this case.

There are stationary and portable versions of mosquito repellers. For lovers of outdoor activities and travel, small models are suitable, and for home use, you can use the schemes of larger models. Let's look at how to properly make an ultrasonic mosquito repeller.

Modern mosquito repellers

Currently, mosquito repellers are famous for their variety.

The most popular remedy, which is most often used at home, are plates. The principle of their operation is simple.

When placed in a special device, they heat up. A specific aroma begins to emanate from the plates, which bloodsucking animals cannot tolerate.

Analogs of plates are liquids with identical effects. In nature, such means are ineffective, as they operate on electricity. Most people, when going on vacation, prefer to take with them spirals, which, when lit, release a smell that repels mosquitoes.

Ultrasonic devices for protection against mosquitoes have appeared on the modern market, which are absolutely harmless for both adults and children, but are destructive to female blood-sucking mosquitoes.

After all, they are the ones who attack people. The operating principle of ultrasonic devices is simple, but at the same time unique. The sound waves emanating from the device are similar to the squeak of a male mosquito, which females are so afraid of. In this case, the females quickly leave the place of deployment. For more information about the action of the plates, watch this video:

Such sound vibrations are absolutely not picked up by the human hearing aid. Of course, the cost of such devices is sometimes significant, but they are very convenient to use. They can be used both at home and outdoors.

Children especially need to be carefully protected from insect attacks. For these purposes, do not forget about banal mosquito nets.

To make mosquitoes forget the way into your house or tent, you can resort to one trick. This type of insect really does not like the smell of eucalyptus. Therefore, you should buy a similar essential oil at your nearest pharmacy and lubricate your mosquito net with it.

OUR READERS RECOMMEND! In the fight against mosquitoes and flies, our readers recommend the Pest-Reject repeller. Electromagnetic and ultrasonic technology is 100% effective against cockroaches and other insects. Absolutely safe, environmentally friendly product for humans and pets. Read more here...

Eucalyptus extract is safe and non-toxic. In the absence of hypersensitivity of the skin, it can be applied pointwise to the body, avoiding the area around the eyes and mucous membranes.

DIY ultrasonic repeller

Anyone with basic knowledge of electrical engineering can make a device with their own hands. On the Internet you can find many different schemes for repelling insects and rodents. Let's consider one of the simplest but most reliable schemes.

Schematic diagram

The circuit consists of 13 elements, including a protective diode and a switch:

1. Resistors R1 – R5;
2. Variable resistor R6;
3. Piezoelectric element (emitter) BQ1;
4. Diode VD1;
5. Transistors VT1 – VT2;
6. Capacitors C1 – C2;
7. Switch S1.

All elements of the circuit can be easily purchased at a radio store.

The key elements are transistors VT1 and VT2, which generate an electrical signal. Using resistors R1 - R5, this signal is adjusted so that the current and voltage are within certain limits. The signal is sent to the piezo emitter BQ1, which reproduces ultrasonic waves. Capacitors C1 and C2 and transistors VT1 and VT2 together with resistors R1 - R5 create a frequency circuit. Diode VD1 is optional, but it is advisable to also include it in the circuit to protect the device in case of incorrect connection. Toggle switch S1 is needed to turn the device on and off. You can also buy the board at a radio amateur store or solder the device without the board, which is impractical and inconvenient. A battery or power supply is used as a power source. The frequency of sound waves is adjusted using variable resistor R6. This frequency regulation will allow you to customize the repeller for any insects and rodents. After assembly, it is advisable to connect the device to an oscilloscope to select the sound frequency as accurately as possible.

Repeller board

The cost of a home-made repeller is significantly lower than ready-made devices. Although the appearance of factory-made devices is much better, the cost of effective and high-quality devices starts from 1000 rubles, while the cost of a homemade repeller starts from 500 rubles.

When choosing methods to combat cockroaches in an apartment, evaluate the pros and cons of each option and use the one that is right for you.

Simple DIY mosquito repeller

Summer is already approaching, which means that in addition to positive joys, such as relaxing in nature and sunbathing, they come to us... or rather, our bad friends who love to drink our blood come to us - mosquitoes. In order to get rid of them and then sleep peacefully at home or in the country, assemble a simple device - a mosquito and other insect repeller with your own hands. You won't need many parts for this.

What we need to create a mosquito repeller:

• Transistor BC547 - https://ali.pub/4gdqnh;
• Resistor 4.7 kOhm;
• Resistor 1 MOhm;
• Resistor 47 kOhm;
• Capacitor 470 uF x 25V;
• Diode 1N4007;
• Piezo emitter with 3 outputs (they are often used in various smoke and gas alarms) - https://ali.pub/4r8tik.

How to make a mosquito and insect repeller, step by step instructions:

Step 1

We solder a 1 MΩ resistor to the base of the BC547 transistor, and a 4.7 kΩ resistor to the collector, and solder the other ends of the resistors together.

Simple DIY mosquito repeller

Step 2

Next, we solder the positive contact of the 470 uF x 25V capacitor to the resistors, and the negative contact to the emitter of the transistor, this is important, do not confuse the polarity of the capacitor.

Simple DIY mosquito repeller

Step 3

Now we solder a 47 kOhm resistor to the resistors and the negative terminal of the capacitor, and solder a diode as an anode to the positive terminal of the capacitor connected to the emitter of the transistor (do not confuse this, this is also very important so as not to burn the device), as can be seen from the picture.

Simple DIY mosquito repeller

We will then solder contacts to this resistor and diode for connection to a 220V network.

Step 4

Now let’s solder the piezo emitter (only a piezo emitter with 3 contacts is suitable for this mosquito repeller circuit). The photo shows which contacts of the emitter need to be soldered to the terminals of the transistor.

Simple DIY mosquito repeller

Step 5

Simple DIY mosquito repeller

Now we solder the power wires from a household AC voltage 220V to the circuit, insert the plug into the socket and if everything is assembled correctly, then a simple mosquito repeller made by yourself should work immediately and after 10-15 minutes you will see that all the mosquitoes in the room have disappeared. You can see other useful homemade products and DIY projects using the links below.

Take home:000

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Tags: repeller, mosquito repeller

Comparison of parameters of different models

Model Typhoon LS-200

The power source of this design is mains voltage. But the Tornado OK.01 model operates on an area of ​​up to 50 square meters. m, the frequency range is much wider: from 4 to 40 kHz. This model is powered by three batteries.

User opinions on different versions

Model Cosmos Economic

The lowest rating belongs to the Cosmos Economy device. None of those who had the opportunity to evaluate it in action were satisfied with the results. Although its cost is extremely low, which is very attractive, however, these costs in almost all cases turned out to be impractical.

But, if you really need to purchase an effective ultrasonic mosquito repeller, which device is better today?

It will be difficult to answer this question unequivocally for the same reason that the range of oscillations of ultrasound frequencies emitted by different types of such insects differs. But there are often positive reviews about Tornado brand devices.

Do-it-yourself repeller

If you plan to purchase an expensive model of such a device, you can easily try to assemble it yourself. It will probably cost significantly less. But to create a truly effective design, you will need some experience in such work. A do-it-yourself ultrasonic mosquito repeller can easily be assembled using one of the many schemes offered by the most advanced users in this field. Here is one of them, created in the Splan 4.0 program:

Repeller circuit

For work, simple, non-scarce elements are used, which can always be found in the right quantity

Particular attention should be paid to the piezo emitter, since it is advisable to purchase an option that creates increased sound pressure during operation. This could be ZP-22

For those who have the opportunity to make a printed circuit board, the following option is offered:

To implement this solution, you will need a ferric chloride solution, with which you will need to etch the tracks on the board, after which they are covered with a protective gel flux. To complete the picture, it is necessary to select a battery of sufficient voltage for comfortable operation of the device for some time.

Watch the video and do it yourself:

When assembling an ultrasonic compact mosquito repeller with your own hands, the most important thing in achieving this task is to create a sufficient level of sound vibration frequency. To adjust this parameter, you should select frequency-setting capacitors C1 and C2 (see diagram). With a fairly large capacity of these elements, the output frequency is within the range of not ultrasonic, but simply sound vibrations.

How to assemble your own mosquito repeller

In the summer, a comfortable stay in nature, at a summer cottage, and even just in a city apartment is spoiled by nasty little tediously buzzing mosquitoes. Many means have been invented to combat these annoying insects. ultrasonic repellers are recognized as one of the most effective . The device uses low-frequency sound to expel insects from the room. The frequencies used in the device are similar to the buzzing of male mosquitoes. Females are disgusted by this sound and fly away from the source. And as you know, it is mosquito “ladies” who drink human blood.

It is not necessary to look for such a device in stores and spend money on purchasing it. If a person has the desire, the skills to work as a radio technician, as well as knowledge of the basics of electronics, then can be made with your own hands

Any radio amateur would call the circuit for such a device primitive. Indeed, it is quite simple.

A device that you can assemble yourself in accordance with this scheme will help you get rid of mosquitoes and even midges. And with the generator frequency increased to the ultrasonic range, this device will allow you to protect yourself from dogs. In the figure you can see the circuit and printed circuit board.

Radio amateurs see that power is supplied from a galvanic element. Power is supplied with voltage from 1.5 to 9V. Protection against connection problems (for example, incorrectly connected) power supply is carried out by diode VD1. The higher the voltage of the device, the more powerful its radiation will become.

Piezo emitters ZP-1 are used as sound-reproducing elements. (can be 3 or 22). You can even use a piezo emitter from an unnecessary watch. Resistors R2… R6 set the operating point for transistors VT1 and VT2. By applying voltage to VT1, C1 is charged, then pulses from C1 open VT2, VT2 for a short moment, charging C2, and it, accordingly, opens VT1 for short moments. Then the whole process is repeated. Thus, the functioning of the mechanism is cyclical. The frequency of the generator is determined by capacitances C1 and C2 and resistance R6. It is possible to connect several emitters in series with BQ1. In this situation, the output power can be increased.

It should be noted that similar transistors can be used. And take capacitors from ceramics. making your own ultrasonic mosquito repeller is simple and quite affordable.

Cockroach repellers

All electronic devices can be divided into the following types:

• ultrasonic;
• magnetic resonance.

Main advantage

Electronic repellers are easy to use - they need to be plugged into an outlet (install rechargeable or regular batteries), the distance from the floor should be within 20-40 cm.

They are more expensive

conventional anti-cockroach products, the average cost can range from 500 to 950 rubles. More expensive devices are designed for large premises (warehouses, storage facilities); their use in apartments or houses is not recommended.

Electromagnetic

Under the influence of electromagnetic pulses, pests hide as far as possible from the source. The electronic cockroach repeller can be used for as long as desired - it does not harm the health of people and animals.

The electronic repellent for cockroaches in the apartment must be plugged into an outlet; the repeller operates at low wave frequencies,

which affect the central nervous system of cockroaches and other insects.

Advantages:

• compact dimensions;
• no requirements for creating special storage conditions;
• efficiency;
• absence of dead insects;
• safety.

The optimal temperature for using an electromagnetic repeller is considered to be from 0 to 40 degrees; to enhance the effect, you can turn on several devices at the same time.

Ultrasonic

The ultrasonic cockroach repeller emits high-frequency frequencies that are inaudible to humans.

waves that are extremely unpleasant for cockroaches.

The effect of ultrasonic waves on insects has a scientific basis - mosquitoes that hear sounds similar to those made by bats leave the place where it occurs in fear.

Ultrasound also helps against cockroaches,

This principle is applied in the production of devices. Their operation is based on an integrated circuit, which includes trigger and multivibrator components, resulting in the formation of antiphase and symmetrical signals at the terminals.

A sound source is connected to these outputs, which is a piezoceramic emitter.

According to reviews, the device helps get rid of not only cockroaches, but also midges, house ants, etc.

Advantages

developments:

• ease of operation;
• non-toxic, safe for people and animals;
• the ability to carry out processing in the presence of people;
• large range of action - the effect of a device installed in one room extends to the entire apartment;
• extended spectrum of action - not only cockroaches die, but also other insects.

Despite the large number of advantages, an ultrasonic cockroach trap also has disadvantages

:

• quite high cost;
• questionable safety.

Riddex pest repelling aid

The principle of operation of the repeller is based on connecting to the network; after connection, the wiring turns into a repeller

, under the influence of which not only cockroaches scatter, but also fleas, ants, rats, mice.

The device is also equipped with flashing LEDs, which have a negative effect on pests. The area of ​​influence of the riddex pest repelling aid repeller reaches 200 sq.m., unlike other models, it does not need to be installed in several rooms.

The anti-cockroach device must be plugged in and kept online until the insects disappear completely; in the future, it is recommended to be turned on occasionally for preventive purposes.

Pests begin to show concern after the first week, mice and rats disappear after 14-20 days, insects - after 7-12 weeks. The device is suitable for use in residential and public areas, the repeller is absolutely safe

for health, does not affect the operation of electrical equipment.

The mechanism of action of an ultrasonic repeller

The operating principle of the mosquito repellent device is to emit ultrasonic vibrations of a certain frequency. The device produces an inaudible and absolutely harmless sound to humans, which is perceived by insects as a call to mate.

However, for fertilized females who bite humans (as confirmed by research results), this squeak is associated only with danger. Due to this effect, the absence of mosquitoes in the radius of activity of the ultrasonic repeller is achieved.

DIY making

Ultrasound against mosquitoes is an excellent opportunity to get rid of annoying neighbors without resorting to industrial chemicals.

If it is not possible to purchase a device, you can make it yourself, focusing on the corresponding diagrams. The latter can be found in abundance on the Internet.

What nuances to consider when manufacturing the unit?:

• The device is powered by galvanic elements.
• Recommended voltage is no more than 9 V.
• The power of emitted oscillations is directly proportional to the supply voltage.
• The role of an electroacoustic device is played by a piezo emitter.
• Suitable capacitors are ceramic.
• The optimal generation frequency is approximately 20 kHz.

Since the current is only 1.5 mA, the device will last on one battery for 2-3 months. To increase the effectiveness of a homemade repeller, it should be placed under the ceiling, in the favorite places of insects.

Criterias of choice

When deciding which device to buy, you should determine the purpose of its use. Stationary models that require a constant connection to the network are suitable for the home; mobile and compact devices that do not take up much space are suitable for the street.

You should first study customer reviews. Some devices don't live up to the promises their manufacturers make.

Attention! There are a lot of fakes on the market - you need to buy devices only from trusted suppliers who have proven themselves on the positive side

Therma CELL

Outdoor repellent lamp. At the same time it is a good night light. It is based on the principle of fumigation - the device heats up and evaporates a repellent that drives away insects. It does not smell and does not harm people.

Characteristics:

• coverage area - 20 m²;
• brightness - 220 Lum;
• works thanks to a butane cartridge;
• requires replacement of consumables - gas cartridges and plates with repellent;
• Safe for children, allergy sufferers and pets.

Price - from 1400 rub.*

Therma CELL

Protector Freetime

The personal protective equipment is made in the form of a bracelet. Emits ultrasound. An excellent option for fans of tourism or country holidays.

Peculiarities:

• made of hypoallergenic materials;
• automatically turns off after 8 hours of continuous operation;
• range of action - up to 1.5 m;
• 4 operating modes.

Cost - from 2000 rubles.

Protector Freetime

Rexant 71-0014

Ultrasound device intended for home use. Requires connection to an electrical network. The affected area is 30 m². It has 2 radiation modes, which eliminates the adaptation of insects. Price - from 250 rub.

Rexant 71-0021

Portable ultrasonic keychain. Repels mosquitoes by imitating the squeak of a dragonfly, their natural enemy. Protects against insects within a radius of three meters. Has 3 operating time modes: 2, 4 and 8 hours. Cost - from 250 rubles.

Sources

• https://apest.ru/komary/sredstva-ot-komarov/otpugivatel-komarov-svoimi-rukami/
• https://belt-wrestling.su/muhi-i-moshki/otpugivatel-komarov-svoimi-rukami-2.html
• https://www.otpugiwateli.ru/otpugivatel-komarov-svoimi-rukami.php
• https://notklop.ru/komary/sredstva-ot-komarov/otpugivatel-komarov-svoimi-rukami/
• https://bezbukashek.ru/tarakany/ultrazvukovoj-otpugivatel-tarakanov-princip-raboty-shema-sborki-pribora
• https://belt-wrestling.su/ru/antiboping/2016/dec/29/257/
• https://stopklopu.com/ultrazvukovoj-otpugivatel-komarov-svoimi-rukami/

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