Do-it-yourself mouse repeller: diagram of an ultrasonic rodent repeller

How it works

The rat and mouse repeller emits sounds at high frequencies that are not perceived by people, but rodents feel ultrasonic waves.
The purpose of the device is to create sound vibrations with frequencies and power that are perceived by rats and mice (frequencies from 30 to 70 kHz).

Most repellers emit only ultrasonic waves, but there are also those that also produce electromagnetic radiation.

Ultrasound devices can only act on the area of ​​a single room, since ultrasonic waves do not pass through walls or floors. Electromagnetic radiation penetrates walls and is blocked by metal plates and objects.

Ultrasound, reaching any surface, is reflected from it. From this we can conclude that one ultrasonic repeller for several rooms in the house will not be enough. There are a large number of such devices on sale, but they are not cheap, so it is more economical to assemble such a device yourself.

Types of repellers and principle of operation

There are such types of repellers as:

1. Ultrasonic. It is a device that affects the nervous system of small parasites through ultrasonic short high-frequency signals, which creates uncomfortable conditions for the animals, as a result of which they want to quickly escape from the given territory. To prevent mice and rats from adapting to the device, the pulse frequency can vary from 20 to 70 kHz. Safe for humans.
2. Electromagnetic. They resemble sound ones, however, in this case the effect is exerted by the magnetic field of the coil. Frequent impulses irritate the sensitive organs of touch in mice and create uncomfortable living conditions. An interesting fact is that in the first hours of operation of the device, there is a sharp increase in the number of rodents. This is due to the fact that the waves of the device spread along the walls, between concrete floors, which forces the rats to leave their holes, shelters, and actively look for a way out.
3. Mixed. They are a cross between the two options listed above. At a given frequency, the device replaces sound pulses with magnetic ones, thereby tormenting sensitive animals. Both devices also have an effect on domestic animals - cats, dogs, parrots, ferrets.

Essence of devices

The ability of ultrasound to affect many animals has long been known. A number of devices that are offered by well-known companies are based on this principle. It should be noted that they have proven their effectiveness in such a rather difficult problem as scaring away harmful rodents from human homes. The circuits of a proprietary ultrasonic repeller are complex, and not even every professional can replicate them at home. In this regard, many people have a question about how to make a simple device for rats and mice with their own hands.

In general, a homemade rat and other rodent repeller is a simple electronic device. The main task is the emission of a high-frequency sound signal, which is not perceived by human hearing and domestic animals, but affects rodents. This condition is ensured by an ultrasonic wave with a frequency in the range of 30-70 kHz. At the same time, the device will be able to scare away rats if the emitter power is sufficient. Thus, modern devices contain sources with a power of up to 100 dB. Naturally, as the power of sound vibrations increases, the effectiveness of the mouse and rat repeller increases.

Do-it-yourself rat and mouse repeller - diagrams

The circuit described here is nothing more than a passive infrared (PIR) motion sensor for repelling animals from your home or garden.

The circuit is based on a single, easily accessible passive infrared (PIR) motion sensor. A PIR (passive infrared) sensor is a pyroelectric device that detects motion by measuring changes in infrared levels emitted by surrounding objects. The PIR sensor has elements made of a crystalline material that generates an electrical charge when exposed to infrared radiation. Changes in the amount of infrared emission from the element change the voltages generated, which are measured by the on-board electronics circuitry. The device contains a special filter called a Fresnel lens that focuses infrared signals onto the element. As external infrared signals change rapidly, the built-in amplifier activates the output to indicate actual motion.

The PIR sensor has a range of about 6 meters. This may vary depending on environmental conditions. The sensor is designed to adapt to slowly changing conditions that typically occur as the day progresses and environmental conditions change, but reacts by making its output active when sudden changes occur, such as when "real" motion occurs.

Ultrasound has a suppressive effect on rats and mice

The PIR sensor module has a 3-pin connection:

• ceramic variable capacitor;
• conclusion;
• short to ground.

Simple device

A very simple repeller diagram is shown in Fig. 1.

Fig.1. Scheme of a simple repeller

A piezo emitter (BQ1) is used as a source of ultrasonic vibrations. In principle, you can use this part of any brand. In particular, the emitters ZP-1, ZP-18, ZP-25 perform well. The frequency circuit that provides the required parameters is formed by transistors (VT1-VT2) together with resistors and capacitors. You can use transistors of the brands KT361B, 2T3307A, 2T3307V, KT3107, etc.

Resistors (R1-R5) ensure that the desired operating mode of the transistors is set and limit the current and reduce the voltage.

It is recommended to use 0.25 W output resistors.

Variable resistance (R6) provides frequency control at the output of the device. Standard output ceramic capacitors are used as loop capacitors (C1-C2). The power source for the circuit can be any power supply (battery, accumulator) with a voltage of 2-12 V. Increasing the supply voltage increases the power of the emitter, i.e. and device efficiency. Protection of the circuit against incorrect supply of electrical power is guaranteed by a diode (VD1). You can use a diode like KD503A.

Electrical circuit and operating principle

The rodent (mole) repeller is assembled according to the electrical circuit diagram below and consists of only two simple logic chips, a transistor and several passive elements located on a printed circuit board. A distinctive feature of the proposed circuit is low power consumption (a set of three AA finger elements with a capacity of 1 A*h is enough for the entire season), which is due to the emission of an audio signal with a frequency of about 480 Hz for two seconds with a frequency of once every 32 seconds. In addition, this mode of operation of the repeller has a more effective effect on moles and increases the time it takes rodents to get used to the sound.

Structurally, the circuit consists of a clock generator assembled on elements DD1.1 and DD1.2 generating a frequency of about 480 Hz, a frequency divider on the DD2 chip, a logical signal adder on DD1.3, a key transistor VT1 and an audio emitter BA1.

The frequency of the rodent repeller clock generator is determined by the values ​​of resistance R1 and capacitor C1. By decreasing or increasing the value of R1 or C1, you can accordingly increase or decrease the frequency of the emitted sound signal.

From the generator, a rectangular sound signal without changing frequency, through logic element DD1.3 and current-limiting resistor R4, is supplied to transistor VT1, turned on in key mode. In silent mode, a voltage close to zero is applied to the base of the transistor and the transistor is closed. In this mode, the current consumption of the rodent repeller is 0.1 mA. In the sound signal emission mode, the current increases to 22 mA. A simple calculation shows that when using batteries with a capacity of 1 Ah, the mole repeller will work for 9000 hours or 375 days.

The signal from the clock generator is also sent to the counting input (pin 10) of the frequency divider DD2. Based on a positive signal drop at pin 9 of the counter, logical zero changes to logical one. In order to ensure the emission of an audio signal with a period of 32 seconds, a logical unit is supplied from pins 15, 1, 2 and 3 through diodes to the 12 pin of logic element DD1.3, locking it. As soon as a logical zero appears simultaneously at pins 15, 1, 2 and 3 of DD2, DD1.3 will pass a signal from the clock generator to the base of transistor VT1 and BA1 will begin to emit sound.

The chain C2 and R2 is used to set the output voltages of the DD2 chip to zero. When supply voltage is applied to the circuit, capacitor C2 begins to charge and a supply voltage appears at its lower terminal, which is supplied to pin R of the microcircuit. When the charging process is completed, the voltage at its lower terminal will drop to zero and will no longer affect the operation of the DD2 chip. Resistor R3 is a load for diodes VD1-VD4, so that there is somewhere for the current to flow and to eliminate interference in the absence of voltage at pin 12 of the DD1.3 microcircuit. C3 is used to suppress interference that occurs during transient processes in microcircuits

Rodent repellers.

Unprofitable neighborhood - rats, mice, moles, shrews, gophers, kitties, chipmunks, mole crickets.

Various types of rodents bring us a lot of losses, troubles, and sometimes diseases. This is an undesirable neighborhood, which we try to get rid of in various ways - we spend money on purchasing poisons, traps, traps, chemicals, biological products, etc. , but often our efforts are in vain.

Agree, when you take care of plants, you see how they grow, bloom... and “THEY” come, What to do?

There are many ways to control rodents. In this article we will talk about a newer and safer, and in a monetary sense, economical method of dealing with our smaller “friends”.

An important discovery was the discovery of rodents’ dislike for high-frequency sounds (ultrasound), which the average person cannot hear, and low-frequency sounds propagating in the ground. Electronic devices emitting these frequencies are safe for people, pets and birds, and underground insects and do not cause interference with the operation of body and radio equipment.

I want to present you with a number of concepts for repelling rodents. (1 – underground rodents, 2 – rats, mice, etc.)

1. Underground rodents (moles, shrews, mole crickets) As is known, they use their heightened hearing to detect soil vibrations. The vibration of the soil warns rodents of danger and forces them to flee. We can use this fact.

It is enough to create a sound vibration in the soil with a frequency of 100 to 400 Hz. You can use a speaker from an old low-power receiver as a transmitter. The emitter is buried to a depth of 30–50 cm in the ground.

Let's start with the simplest devices. The most common parts are used for their manufacture.

Option No. 1 You can use an audio multivibrator on PNP or NPN transistors. With a supply voltage of 4.5 - 9 V, its power is sufficient to distribute the signal over 300 - 1000 m2. The disadvantage of this design is the constant operation. Theoretically, the signal should arrive in periods and you will have to turn the multivibrator on and off from time to time.

When using the listed parts, the signal frequency is about 200 Hz. Speaker B1 – 0.25 W or 0.5 W.

Rice. 1. R1, R4 – 1 room; R2, R3 – 39 com; R5 – 510 ohm; C1, C2, C3 – 0.1 µF; V1,V2 – MP 26 or MP42; V3 – GT 402, GT403.

Rice. 2. R1, R4 – 1 room;
R2, R3 – 39 com; R5 – 1 room; C1, C2, C3 – 0.1 µF; V1,V2 – KT315; V3 – KT815 Option No. 2 As I noted above, the signal should be emitted periodically, thus we emit movements of the earth’s layers as before an earthquake. This can be achieved by using two multivibrators, one of which emits the signal we need, the second controls the operation of the first multivibrator. As a result, from the speaker we will hear “beep-pause-beep-pause, etc.” The schematic diagram is shown in Fig. 3.

Rice. 3. Details: Rp – 100kom; R1, R4, R6, R9 – 1 room; R2, R3 – 47 com; R7, R8 – 27 rooms; R5, R10 – 510 ohm; C1, C2, – 500 µF; C3, C4 – 0.22 µF; C5 – 0.1 µF; V1,V2,V4,V5 – MP 26 or MP42; V3,V6 – KT 814, KT 816; VD1, VD2 – AL 307; B1 – 0.5 or 1 W with a resistance of 8 ohms.

Let's look at how the electronic “filling” of the repeller works in Fig. 3. The basis of the device is multivibrators. One of them on transistors V4 and V5 generates oscillations with a frequency of about 200 Hz. Transistor V6 - amplifies the power of these oscillations. As can be seen from the diagram, the multivibrator on transistors V4, V5, V6 are the load of the right arm of the multivibrator assembled on transistors V1, V2, V3. Thus, power is supplied to this multivibrator at the moment when transistors V2, V3 are open. At this time, the resistance of their emitter-collector sections is very small, and the emitters of transistors V4, V5 and V6 are practically connected to the positive terminal of the power source. When transistors V2, V3 are closed, the multivibrator does not generate. In other words, the device on transistors V1, V2 and V3 plays the role of an automatic power switch for the multivibrator on transistors V4, V5, V6. Variable resistor Rp is used to change the length of pauses. LEDs VD1, VD2 are used for visual indication of “work-pause” modes. You can use any low-power transistors in the repeller, for example the MP series of pnp structures, KT 361, KT 203, KT3107, etc. The KT 816 transistor can be replaced with GT402, GT403, P201, P214, etc. As a power source, you can use solar panels, two type 3336 batteries connected in series or from a mains power supply with an output voltage of 4.5 - 9 V. This device starts working immediately and does not require additional settings.

Option No. 3 The underground rodent repeller can be assembled on the very common K155LA3 microcircuit using an intermittent signal generator circuit.

And to amplify the sound, use a push-pull transformerless power amplifier as shown in Fig. 4.1a and 4.1b or using an audio transformer from low-power receivers as shown in Fig. 4.2 Power supply voltage for repellers – 4.5 – 5V. The operating principle of the intermittent signal generator is similar to the device described in option No. 2. It also contains two generators, one of which generates the frequency of the audio signal we need, it is assembled on the LE AND-NOT DD1.3 DD1.4, the second controls the operation of the first and is assembled on the LE AND-NOT DD1.1 DD1.2.

The frequency of each oscillator depends on the capacitance of the capacitor and the resistance of the resistor. For the generator on the LE AND-NOT DD1.3 DD1.4 – C2, R2 and, accordingly, for the generator on the LE AND-NOT DD1.1 DD1.2 – C1, R1. The frequency of the generated pulses is determined by the dependence F=1/T; where T≈2.3СR, subject to compliance with the restrictive condition for choosing a resistor resistance of 240 Ohms

Fig.4.1a

And so let’s look at the details of the device in Fig. 4.1a. microcircuit K155LA3 or K131LA3, C1 - 2200 μF, C2 - 4.7 μF, C3 - 47 - 100 μF, R1-R2 - 430 Ohm, R3 - 1 com, V1 - KT315, V2 - KT361 or other low-power transistors, for example series "MP". Dynamic head with a power of 0.25 W with a voice coil with a resistance of 8 - 10 Ohms. To increase power, you can use transistors, for example V1 - GT404, V2 GT402. Power supply 4.5 – 5V

Fig.4.1b

Option in Fig. 4.1b differs from the version in Fig. 4.1a is a more powerful output sound amplifier assembled on three transistors. Details: microcircuit K155LA3 or K131LA3, C1 - 2200 μF, C2 - 4.7 μF, C3 - 47 - 200 μF, R1-R2 - 430 Ohm, R3 - 1 ohm, R4 - 4.7 ohm, R5 - 220 Ohm, V1 – KT361 (MP 26, MP 42, KT 203, etc.), V2 – GT404 (KT815, KT817), V3 – GT402 (KT814, KT816). Dynamic head with a power of 0.25 - 0.5 W with a voice coil with a resistance of 8 - 10 Ohms. Power supply 4.5 – 5V

Rice. 4.2

In the version shown in Fig. 4.2, a TV-12 transformer is used as an output amplifier (a transformer from any small-sized transistor receiver can be used). Dynamic head with a power of 0.25 W with a voice coil with a resistance of 8 - 10 Ohms. Power supply 4.5 – 5V

Option No. 4 In the above circuits of intermittent signal generators on the K155LA3 microcircuit, larger capacitors and low resistance resistors are included in the driving circuit, which limits the range of smooth adjustment of the control pulse repetition rate. In repellers, the diagram of which is shown in Fig. 5, a similar drawback is eliminated by connecting a transistor to the inputs of LE DD1.1, which plays the role of an emitter follower with a large input and low output resistance. Therefore, it is possible to use resistors with higher resistance than in previous circuits, and the limiting condition for choosing resistance looks like 240 Ohms . Fig. 5

Parts used: K155LA3 or K131LA3 microcircuit, C1 - 100 μF, C2 - 4.7 μF, R1 - 260 Ohm, R2 - 430 Ohm, R3 - 1 ohm, Rp -30 ohm, V1 - KT361 (MP 26, MP 42, KT203, etc.), V2 – GT404 (KT815, KT817). Dynamic head with a power of 0.5 W with a voice coil with a resistance of 8 - 10 Ohms. Power supply 4.5 – 5V.

Option No. 5 And one more device on a fairly common foreign microcircuit from the 4000 series. This design is taken from the book “135 AMATEUR RADIO DEVICES ON A DIFFERENT CHIP” by Newton S. Braga. (Project 25 Sound alarm device with powerful output (E, P) p. 73)

Although the article relates to alarms, this device for repelling underground rodents fits our topic perfectly. The design has a number of positive aspects. Let us consider in detail the principle of operation of the device. The output stage is based on transistors; they are capable of delivering several hundred milliwatts to the speakers. As in previous schemes, the device consists of an audio tone generator on LE DD1.2 and a control oscillator on LE DD1.1. The signal repetition frequency is adjusted by variable resistor Rp1, audio tone - by variable resistor Rp2. Changing the tone and repetition rate of pulse packets can be done by selecting the appropriate values ​​of capacitors C1 and C2. You can experiment by changing their values ​​to suit the purpose of the device. The schematic diagram of the device is shown in Fig. 6.

The current consumed by the device is about 50 mA. The supply voltage of the microcircuit is 3-9 V. To improve the acoustic characteristics, the loudspeaker should be placed on a plastic surface or in a small case. Microcircuit CD 4093, domestic analogue of K561TL1. Rice. 6

Parts used: Rp1 – 1.5 MOhm, Rp2 – 47 kOhm, R1 – 100 kOhm, R2 – 47 kOhm, R3 – 4.7 kOhm, C1 – 47 µF, C2 – 0.1 µF, C3 – 47 µF, C4 – 100 µF. V1 - KT315 (KT815), V2 - KT361 (KT814), speaker 0.25-0.5 W - 4 - 8 Ohms. Square 3336 batteries connected in series are ideal for powering the device.

I wish you good luck, feel free to experiment, try it. The left column offers options on how to manufacture the described devices. And we will move on to the most malicious and causing significant damage - mice, rats, etc.

2. Rats, mice, gophers, “kissies”, chipmunks

These annoying “neighbors” cause damage not only in the garden, but also in everyday life, in warehouses, basements, cellars, food storage areas, in the holds of ships, in garages, and they damage electrical wiring. nutrition, spread diseases and much more. Think about it - after all, you will spend less money and effort on purchasing or manufacturing a repellent device than constantly purchasing poisons, poisoned baits, traps, losing money.

Rodent repellers are used not only in gardens and vegetable gardens, but also in various premises: domestic, warehouse, residential (apartments, offices, country houses, etc.), basements, granaries, as well as in manufacturing and livestock enterprises.

What is the operating principle of this device? What are its advantages over other methods? The rodent repeller emits ultrasonic waves (with a frequency exceeding 20 kHz), which, in turn, repel rodents.

Ultrasonic frequencies have an extremely negative effect on rats and mice. The emitted sound waves cause anxiety and fear in them, so rodents tend to leave the room irradiated by ultrasound. Rat repellers have undergone laboratory tests, which have shown that with constant exposure, rats and mice experience an increasing stress state and leave the room within several weeks. Typically, the period of their care ranges from two to four weeks, depending on the type of rodents, their numbers and how strong the ultrasonic radiation is. Mice and rat pups are deaf for two weeks after birth, so ultrasound does not affect them at first. The recommended exposure time is four to six weeks. And as a preventative measure, the device can work continuously.

Let's start describing the devices. I would like to warn you in advance that at high frequencies we will need more powerful signal amplification than in devices for repelling underground rodents, this is due to the peculiarity of the passage of a high-frequency signal in the air and the ability to reproduce the signal with high-frequency dynamic heads. As a result, repellers consume more current and must be powered from an alternating voltage network or from a car battery. The average current consumption of repellers during operation ranges from 250 to 800 mA for the electric meter. Such energy consumption is practically not noticeable, but for batteries it is already significant.

Option No. 1 You have already seen the proposed circuit in Fig. 7 in devices for moles, the difference is in the output stage. To increase the output power, a compound transistor is used here, and a variable resistor is added to the signal generator. The speaker must be high-frequency with a driver impedance of 8 ohms. Suitable, for example, from a TV - 2GD-36K, 8 Ohm GOST9010-78, or from speakers. To increase stress in our small charges, in addition to changing the length of pauses with resistor Rp1, I added variable resistance Rp2 to change the signal frequency within 15 kHz. This combination increases stress in animals, and periodic changes in the frequency of the sound cause rats and mice to leave you more quickly.

The repeller emits a sound signal from 28 kHz to 44 kHz. The device has a pause-work ratio of 1/3. Supply voltage 5V. The ratio in the choice of resistances is the same as in the devices described for underground rodents on the K155LA3 microcircuit.

Fig.7.

In the circuit diagram in Fig. 7, the following parts are used: microcircuit K155LA3 or K131LA3, C1 - 100 μF, C2 - 0.033 μF, R1 - 260 Ohm, R2 - 240 Ohm, R3 - 1 kohm, Rp1 -30 kohm, Rp2 -220 Ohm V1 - KT361 (MP 26 , MP 42, KT203, etc.), V3 – GT404 (KT815, KT817). Power supply 4.5 – 5V.

Option No. 2 Although at first glance such a scheme seems complicated, I consider it the most practical and universal. Like all previous options, if assembled correctly and the parts are in good working order, it starts working immediately. Output power is 0.8 - 1W.

Fig.8.

How to make an emitter for underground rodents. In different environments, low-frequency sound waves travel at different speeds and over different distances. We use a regular speaker from an old radio as a transmitter. To improve performance and increase the area of ​​sound wave propagation, you can simply attach the speaker to a square or round plastic plate. see fig.

When moving forward, the speaker diffuser compresses the air in front of it and discharges it from the air. These areas of compression and discharge go around the diffuser, overlap each other and cancel each other out. When the diffuser moves backwards, the same picture is obtained. This effect is called an acoustic “short circuit”: the diffuser only moves air from one side to the other.

To eliminate this effect, the loudspeaker is mounted on a shield (screen). In this case, the change in pressure in the air layer immediately adjacent to the diffuser will be transmitted and sent further, i.e. more powerful sound emission will occur.

Place the assembled emitter in thick polyethylene to prevent moisture from entering and you can bury it in the desired place, to a depth of 30-50cm

If you have any questions, you can leave a message at: [email protected] , I will be happy to share my experience.

Author of the article: Skrabtsov Dmitry.

You can ask your question and chat with the author in the topic “Plant protection (Rodent control)”

Advantages of the device

Repelling mice with ultrasound has a number of advantages:

• no need to search for and remove the carcasses of dead rodents;
• there is no danger of poisoning pets with poisons;
• safe for people;
• works throughout the room, no need to update baits.

The electronic device repels not only rats and mice, but also many insects. In parallel with rodents, you can remove ants, cockroaches, and spiders from the house.

A properly assembled homemade ultrasonic mouse repeller works no worse than a factory one, but has its drawbacks. A more effective option is a combined version of the device that generates both ultrasonic and electromagnetic waves.

Advantages over other electrical appliances

The electromagnetic repeller is environmentally friendly and harmless, has a compact size and low power consumption. The emitter can operate at any temperature and any air humidity. It does not contain harmful chemicals and is able to work continuously until pests are completely eliminated from your home, apartment, or office. The innovative device operates absolutely silently. Unlike ultrasonic emitters, which repel mice with high-frequency sounds, electromagnetic devices operate throughout the entire perimeter of the house. The fact is that ultrasonic waves are not able to penetrate walls and furniture, which is why such devices operate only in the room where they are turned on.

Electromagnetic repellers have a large coverage area and work unhindered. This action is due to the fact that electromagnetic waves freely penetrate walls, furniture and other obstacles, due to which they are able to scare away rodents even from hard-to-reach and hidden places. Therefore, if you drive rats and mice out of their holes and nests, they will leave their homes en masse and for a long time.

The electromagnetic mouse repeller is absolutely harmless to people and pets, but dangerous to all rodents without exception. Therefore, before connecting the device to the network, it is necessary to remove all domestic rodents from the house: hamsters, guinea pigs, etc. In addition to furry pests, the device also affects other domestic parasites in the form of insects: ants, bedbugs and spiders.

The area of ​​action of the electromagnetic emitter against mice reaches 130 m². But this is only for enclosed spaces with a closed electrical network. Such repellers are absolutely ineffective when used in open spaces where there is no electrical wiring, or in very large rooms. Therefore, it is better to use high-power ultrasonic repellers in warehouses and production workshops.

The effectiveness of an ultrasonic repeller

When dealing with pests yourself, there are a few things to keep in mind. No matter what method you use, physical, chemical or electronic, you must remember to avoid any pests or rodents at all costs. They can be dangerous as some of them are poisonous. Additionally, if they feel threatened, they may bite. Rats, mice and bats sometimes carry diseases, and close contact with them can spread the disease. If you use chemicals and the like to get rid of pests, remember that if they are deadly to animals, then in all likelihood they are also dangerous to you.

Rodents are not only pests, but can also be dangerous to humans

Among the three methods, the safest pest control method you can do is a DIY electronic mouse and rat repeller. All that is required is a simple device that can be connected to electricity and it will work immediately.

Limitations in the operation of the mouse repeller

True, the electronic mouse repeller has one difficulty - its power supply.

In order for it to work, constant electricity is required.

It runs on a simple network and does not consume a lot of energy, so you can leave it on and not be afraid of huge bills.

Don’t be upset that there are hordes of gray guests in the house and you just can’t kick them out.

The ultrasound of the device can help without causing harm to you and others.

But you need to take into account that the presence of such a device in the house, although it minimizes the risk of rodents reappearing, still requires additional preventive measures.

What do you need

There is no need to spend money on factory-made devices, since it is quite possible to make a mouse and rat repeller yourself. You can make the device using a ne555 or ne556n timer. Microchips will produce a signal that will repel rodents. To assemble an ultrasonic device, you will need the following parts:

• resistors R1, R2 (for adjusting the ultrasound output level) – 2 pcs.;
• resistors R3, R4, R5 (to reduce the voltage in the electrical network) - 1 pc. each;
• capacitors C1, C2, C3 (for forming a frequency circuit) - 1 pc. each;
• transistors of the GT404, KT361 and GT402 brands (for forming a frequency circuit) – 1 pc. each;
• diode – to protect the device in case of incorrect connection to the network;
• piezo emitter – for producing an ultrasonic signal;
• speaker;
• battery;
• toggle switch to turn the device on and off.

Assembly Rules

DIY ultrasonic rat and mouse repeller

The rat and mouse repeller circuit is drawn up on PCB. In the absence of one, everything is connected by wires. Separate wires are routed to the battery and speaker. The sequence of assembling the repeller circuit is as follows.

1. Checking the drawing.
2. Stripping wires, treating them with tin and rosin.
3. Sequential soldering of parts.
4. Connecting the power supply.
5. Testing.
6. The homemade device is placed in a suitable housing or box, in which holes are made in the speaker area.

You should not expect instant results from the device. The effect will be noticeable after 2-3 weeks of continuous operation of the electronic device. You can achieve full results in the fight against rats and mice after 2 months.

When using an ultrasonic device against mice and rats, remember that ultrasound is repelled from a hard surface and absorbed by a soft one. Therefore, its use will be more effective in a room that is not cluttered with objects. To get rid of mice and rats in an apartment or private house, it is necessary to use devices of this type in all rooms at the same time, without giving rodents a chance to move from one room to another.

There are several ways to deal with a rodent infestation in your home yourself and practically free of charge. To make an ultrasonic mouse and rat repeller with your own hands, you do not need almost any expenses other than purchasing the initial equipment.

Rules for using repellers

In order for the use of ultrasonic repellers to bring maximum benefit, it is important to follow the basic recommendations for their use.
While the repeller is working against mice and rats, it is strictly forbidden to use other means of rodent control

Avoid food baits and special traps, since the purpose of the repeller is to create uncomfortable living conditions for rodents, while baits, on the contrary, lure them back. The effect of the ultrasonic device extends only to one room, devoid of partitions and walls, so to combat rodents in a multi-room apartment you will need several devices. It is also worth noting that the device works better in an empty room, without soft furniture and other interior elements. The point is that ultrasonic waves are absorbed by soft objects and repelled by hard ones, which means their action in an empty room will be more effective. A battery-powered mouse repeller is used exclusively at above-zero temperatures; it is irrational to use it in unheated rooms in winter (the batteries freeze and the device does not work). The mouse repeller must work continuously for at least 3-4 weeks. After this time (if the rodents have disappeared), a general cleaning of the room should be carried out and the slightest cracks and cracks through which other pests can enter the house should be eliminated

During operation of the device, it is important to maintain room hygiene - keep the room clean, hide and seal food, and remove garbage in a timely manner. The operation of devices in different rooms should take place simultaneously, since mice can move from one room to another without disappearing from your apartment

After eliminating rodents from a room, ultrasonic repellers should be turned off, since such devices are intended only to combat existing harmful inhabitants, and not to prevent their appearance. If the repellers work all the time, new mice and rats that move into your home will get used to the annoying sound from the very beginning, and the device will not affect them.

While the repeller is operating against mice and rats, it is strictly forbidden to use other means of rodent control. Avoid food baits and special traps, since the purpose of the repeller is to create uncomfortable living conditions for rodents, while baits, on the contrary, lure them back. The effect of the ultrasonic device extends only to one room, devoid of partitions and walls, so to combat rodents in a multi-room apartment you will need several devices. It is also worth noting that the device works better in an empty room, without soft furniture and other interior elements. The point is that ultrasonic waves are absorbed by soft objects and repelled by hard ones, which means their action in an empty room will be more effective. A battery-powered mouse repeller is used exclusively at above-zero temperatures; it is irrational to use it in unheated rooms in winter (the batteries freeze and the device does not work). The mouse repeller must work continuously for at least 3-4 weeks

After this time (if the rodents have disappeared), you should carry out a general cleaning of the room and eliminate the slightest cracks and cracks through which other pests can enter the house. During operation of the device, it is important to maintain room hygiene - keep the room clean, hide and seal food, and remove garbage in a timely manner. The operation of devices in different rooms should take place simultaneously, since mice can move from one room to another without disappearing from your apartment. After eliminating rodents from a room, ultrasonic repellers should be turned off, since such devices are intended only to combat existing harmful inhabitants, and not to prevent their appearance. If the repellers work all the time, new mice and rats that move into your home will get used to the annoying sound from the very beginning, and the device will not affect them.

By following all these recommendations, you will achieve maximum repellent effect, and this will allow you to remove mice and other rodents from your home very quickly and reliably.

Modern Kulibins will be interested in assembling a repeller according to the scheme themselves, purchasing everything they need from radio stores

What is the work based on?

The purpose of the device is to create high sound vibrations (frequencies from 30 to 70 kHz), to which rodents are sensitive. However, if the frequency is constant, then pests can adapt. Therefore, the ultrasound frequency must change periodically throughout the entire range.

When the device is operating, individuals experience an increase in feelings of danger and anxiety, which forces them to leave their homes.

Universal ultrasonic repeller

Features of ultrasonic repeller:

1. When using a repeller, other methods of control are prohibited, such as poisons based on animal bait and various traps. Because with this device, which creates discomfort for rodents, they have the opposite effect.
2. Ultrasonic waves are repelled by hard objects and absorbed by soft ones. Consequently, in a freer and more spacious room the device is most effective. Ultrasound does not pass through walls, so each room will need a separate repeller.
3. The battery-powered device should not be used in unheated rooms in winter. Batteries will freeze in sub-zero temperatures.
4. To achieve maximum effect, the device must be operated continuously for a month.
5. Repellers in all rooms must work simultaneously so that rodents do not wander from room to room, but leave the house forever.
6. This device is not used for prevention, so it is turned off after all pests have been eliminated.

How to make a device with your own hands?

For those who are familiar with electronics, making an ultrasonic mouse and rat repeller with your own hands is not difficult. On the Internet you can find many detailed diagrams and videos on assembling this device. Often the device consists of:

• variable and conventional resistors - they reduce the voltage in the network, regulate the level of ultrasound output;
• transistors - create a frequency circuit;
• capacitor – smoothes out current ripple in the circuit network;
• switch (toggle switch) – turns the device on and off;
• piezo emitter – produces ultrasonic signals – the main element of the device;
• diodes – protect the repeller from incorrect connection to the power supply;
• battery - crown or power supply.

Ultrasonic membrane

All parts and components can be purchased at a radio amateur store. In addition, you will need devices for soldering the radio circuit. The repeller dimensions are compact. No special device settings are required. You may just need to adjust the frequencies.

Stages of work

There are several options for assembling an ultrasonic rodent repeller with your own hands. You need to choose a specific circuit based on the power of the future device, available parts, soldering skills and much more.

Most often, the basis of the repeller is a board with soldered tracks that connect the elements of the microcircuit. However, in the simplest models, the parts are connected using wires.

However, regardless of the assembly method you choose, the general algorithm of actions will be as follows:

Ultrasonic repeller circuit

1. Choose a repeller design based on your personal needs.
2. Buy the necessary radio components. You can easily find some parts at home. For example, the speaker can be removed from an old receiver or tape recorder.
3. Prepare a soldering iron and auxiliary substances (tin, rosin, flux, acid, etc.).
4. Solder the base of the ultrasonic repeller - a symmetrical multivibrator, according to the selected circuit.
5. Connect the speaker and battery. A slightly perceptible squeak should appear in the speaker.
6. If there is no squeak in the speaker, or it is too strong, you need to increase or decrease the frequency of the device accordingly. This is done by increasing or decreasing the capacitance of the capacitors by 0.1 μF.

The simplest ultrasonic device for repelling rodents is ready. To make a more complex repeller that will automatically change the oscillation frequency, you will need serious equipment and considerable skills in calculations and soldering of microcircuits.

How to make an ultrasonic gun with your own hands? (video)

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

We make a device at home that frightens pests

The creation of such devices does not require special skills or special knowledge; any novice radio amateur will be able to assemble them with his own hands, based on the included instructions and diagrams.

For this you will need:

• regular soldering iron,
• parts R7, R5, C6, C5, DD1.3, DD1.4.

Using a soldering iron, a symmetrical multivibrator is assembled from parts; it is the basis of the entire device.

The frequencies of the emitted ultrasonic waves can be adjusted by adjusting the generator. The signals emitted by the generator are fed to a device that amplifies their power.

The emission of ultrasonic waves occurs due to the operation of the Sp1 element.

The strength and frequency of oscillations can be calculated using the formula F=1/(R5xC6+R7xC5).

To assemble a more complex device with your own hands, capable of constantly automatically changing the range of ultrasound vibrations, you will need a higher level of skill and skill. You can do it based on the proposed scheme:

Modulation of the frequency of the emitted ultrasound occurs after a certain time interval. Setting up the device is carried out in stages and begins with determining the operating frequency of the generating element.