An ultrasonic whistle for dogs is an improved invention of the Englishman Francis Galton, who back in 1883 invented a device for training circus animals. Modern whistles are also used for training, but this time for domestic animals, in particular, any breed of dog. Their advantage is that the sound produced is heard only by dogs, which means that such work with the animal will not bring any inconvenience to strangers.
How does it work
- The device creates acoustic vibrations, which can be compared to the sound signals emitted by the tip of a knife when an air flow is directed at it. The role of the tip is played by a cylindrical resonant cavity, and the gas passed under high pressure contributes to the emergence of sound vibrations, the frequency of which depends on the size of the nozzle itself and the resonant cavity.
- Most models of ultrasonic whistles have a frequency of 170 kHz. It must be said that the human ear perceives the sound range ranging from 16 to 20,000 Hz, but the dog's ear is more sensitive.
- A person cannot hear the sound produced by the device, but a dog can recognize it at a distance of 450 m.
- The device is compact, light in weight, and the training process with its help is simple. The material used is nickel-plated brass, which gives the device strength and durability. For ease of wearing there is a fastening ring. Today you can find devices on sale in which you can change the tone and sound frequency. In particular, change the training mode to the repelling mode. Thus, you can protect yourself and your loved ones, as well as your beloved pet, from a pack of stray dogs.
How to use
Many people are interested in how to properly use an ultrasonic whistle?
- It takes time and repeated repetition to develop a conditioned reflex. Moreover, sound as a conditioned stimulus should always precede the unconditional stimulus, that is, a treat. It is necessary to alternate signals of different lengths. For example, to teach the recall, the command “come to me”, emit a long series of signals, and for the dog to remember the command “sit”, produce a series of short consecutive signals.
- When you go for a walk with your animal, loosen the leash to the maximum possible length and use an ultrasonic whistle to call the dogs, blowing it three times. Stop and pull the leash towards you, letting your pet know that you are calling him to you. Secure the result by repeating these steps 5 times. If necessary, you can change the tone of the whistle, choosing the most optimal one for your pet. Having consolidated the behavior reflex, you can try to let the dog off the leash and force it to approach only with the help of a whistle.
- To scare away dogs using an ultrasonic whistle, it is recommended to switch the device to the appropriate mode and point it at the object, holding the button pressed for 3-6 seconds. As practice shows, animals begin to react to it differently: some tuck their tails and run away, others whine and back away. It may happen that the repellent device does not work. In this case, the cause can be sought either in dead batteries or in the animal’s weakened hearing.
How to make it yourself
You can also make a dog whistle with your own hands. To do this, you only need a small willow branch 25 cm long and slightly thicker than the thickness of your thumb.
Stages of making a whistle with your own hands:
- One end of the branch must be cut at an angle of 45 degrees. The sharp part of the resulting corner can be shortened slightly for ease of use, since it is from this side that you plan to whistle;
- To create the required sound frequency, a small hole must be made on top of such a whistle. To do this, use a sharp knife. A small hole will provide a better whistle sound;
- Now you need to remove the bark from the branch. To do this, you need to step back approximately 10 cm from the edge where you plan to blow and cut the bark in a straight line. Then, it must be cut to diameter. After making the cut, start tapping the bark with the blunt side of the knife: this will make it easier to remove. However, the integrity of the bark must be preserved, since it will still be useful;
- On the part left without bark, you need to cut a groove. It can be made deeper - then the whistle will also be deep. Make a small cut in the bark above the groove;
- Wet this part of the whistle with water and insert it into the previously removed bark.
Everyone understands how to use such a whistle. You can also make a good ultrasonic whistle for scaring dogs with your own hands from a regular stun gun.
After all, dogs are afraid not only of sharp sounds, but also of bright flashes of light and the smell of ozone. And this device cracks loudly and sparkles brightly, and even emits ozone.
As practice shows, it works on any breed of dog - both the smallest representatives and large, frightening-looking specimens. You can carry it with you in your purse, and for cyclists, whom dogs “love” so much, it can be placed in a purse. While on the move, tap the device and move on calmly. That's all the recommendations. During the training process, do not forget to praise your four-legged friend, and the learning process will go faster.
Well, the main thing is love for your pet, which, as you know, will demolish all obstacles along the way. Good luck!
According to most users of this device, an ultrasonic whistle for dogs is indeed a very useful thing. Dogs will be afraid of you if you use it in close proximity to the animal. But it does not pose any harm to you. The operation of an ultrasonic repeller is simple - it emits a high-frequency sound that a person practically cannot hear. But the animal is afraid of this sound. Very simple and effective protection against dogs.
An ultrasonic dog repeller whistle is used for more than just animal control purposes. This simple device, which can be made at home, can also be used to train a dog. The whistle's operation is based on the fact that air that hits metal obstacles causes them to vibrate. The frequency of sound vibrations is so high that only animals can hear these sound waves. The owners of some dogs actively use these whistles in the training process. Using a dog repeller is a good and effective way to get a dog to pay attention to its owner.
Take a look at all the options for deterrent devices - there are many. Manufacturers offer ultrasonic whistles, guaranteeing that they are effective and will protect you from stray and aggressive dogs 100 percent, because no dog will be happy with an ultrasound. This is not always the case; in some cases, animals practically do not react to ultrasound (when the device is applied to a dog’s hearing, the ultrasound is difficult for her to hear and does not cause her severe discomfort). This most often happens if the dog has poor hearing. Electric shock guns can also be used as a repeller. Bright light will frighten the animal, and the smell of ozone from electrical discharges will enhance the effect.
How to make an electronic repeller
- With the slightest knowledge of electronics, assembling the device is not at all difficult. Large financial costs will not be required either. You need to purchase a microcircuit and transistors. To regulate the frequency of sound, it will be necessary to create an additional unit consisting of resistors, transistors and diodes designed for protection in case of polarity reversal.
- After assembling the device, you need to check the resistance of the resistors so that the load is applied to them evenly; additional installation of a piezoceramic emitter will be required.
- Power supply for the repeller is a standard crown, voltage -9 V.
- The LED flashlight is built into the front of the housing.
- To increase the power, it is advisable to install 8 batteries (AAA standard), capacity 300 mAh, under the crown.
- The essence of the electronic device is the activation of a high-frequency pulse generator when a dog approaches. The frequency is not perceptible to humans, but animals hear the noise of the generator very well.
People who have been hurt by dogs are then afraid of them all their lives. If there is a pack of unfriendly dogs in your area, always carry a repeller with you. Moreover, it is easy to assemble it with your own hands from improvised means.
Example of device operation
Let’s take for example the Cobra ultrasonic dog repeller - it is a fairly small and compact electronic device. Outwardly, it resembles a remote control or car key fob for alarm control. It guarantees the buyer safety while walking through an area where there are stray animals and when meeting aggressive purebred dogs. It will also be useful while jogging and walking in the park, walking with your child and while children are going to school. One of the advantages of this device is its range. It can scare away an animal that is ten meters away from you.
Metal whistles
And now regarding ultrasonic whistles for dog training. It can be made at home, although it is much easier to buy it in a store. Moreover, nowadays manufacturers offer whistles in which the frequency of sound vibrations can be adjusted.
The human ear can perceive sound vibrations in the range from 15 to 21,000 Hertz, while the hearing of animals is much more sensitive. The ultrasound that comes from the whistle is practically inaudible to humans, but a dog can identify it at a distance of up to 400 meters. The material usually used is brass, which is coated with a protective layer of nickel. This is due to the special properties of metals, ensuring durability and protection against corrosion.
When training dogs, it is better for the owner not to use an ultrasonic dog repeller, but to use a whistle so that the dog responds more effectively to the owner’s commands, even if it is distracted by something.
Ultrasound is a fairly strong irritant. However, when applied, it is necessary to use a certain set of audio commands. This could be one short signal, several short signals, a long signal, and so on. Everything is like Morse code. When using one or another command in the process of training a dog, it is necessary to use certain signal algorithms and, of course, not to forget about the incentive - to feed the dog something tasty.
How to escape from dogs if there is no repeller
And there are methods for this case:
- If you are attentive and not a panicker, then look around the dogs, identify the leader and hit him on the nose. Most likely, he will run away, and the pack will follow him. How to identify him - he will attack first.
- “Never run from a dog!” Have you heard this? This is not entirely true. It’s just that over a long distance the dog will 100% catch up with you, knock you down and bite you to death. But if there is a tree with branches within a radius of 10-20 (depending on your sports training), run headlong. Climb higher and call 112. Fences, sheds and garages are also suitable if you know how to climb them quickly.
- If you are wearing heels or there are no high-tops nearby, sacrifice hand luggage. As soon as the dog rushes, offer him a bag or backpack. This will give you a head start.
- An excellent option is if there is a cobblestone or brick lying under your feet. Raise it above your head and walk towards the animals. You will become taller, and a threatening gesture usually has an intimidating effect on mongrels. The dogs will almost certainly run away.
The main thing in any situation is not to panic. But nothing brings peace of mind like having a good repeller at hand. Make it yourself or buy it in a store and no longer be afraid of menacingly growling tramps on the way.
General information about whistles
The design of the first whistle was developed by the British Francis Galton back in 1883. Hamilton was a trainer and used whistles in the circus. Today's whistles can be used for any breed of pet. As you know, a dog, unlike a person, can pick up the sounds that a dog whistle makes. In practice, it is clear that dogs pay much more attention to such sounds than to human commands.
The high-frequency sound given to the dog indicates what the animal needs to do, in contrast to the owner's voice, the tone of which can vary. In such cases, the animal may not understand what the person wants from her, and accordingly, she will not feel so confident. Experts recommend training dogs to use a whistle from puppyhood.
Operating principle
Let's move on to the principle of operation of these attributes. It's no secret that a whistle emits acoustic vibrations. To make the principle of its operation more clear to you, let’s consider it using the example of an ordinary kitchen knife, which cuts through the air with the movement of the hand. In this case, its blade is a cylindrical attribute cavity. Instead of air, gas is supplied under pressure, which is necessary for the appearance of sound vibrations.
In the case of the example, the frequency of sound vibrations is characterized by the size of the nozzle. Today, almost all models of accessories sold on the domestic market operate at a frequency of 170 kHz. This figure is too high for humans, since the human ear is capable of perceiving signals whose frequency does not exceed 20 kHz. Accordingly, the sound produced by the whistle cannot be heard by humans. The pet, in turn, is able to recognize such sounds at a distance of up to 450 meters.
As you can see from the photo, the dimensions of the whistle are very small, this size is quite compact. With the help of this attribute, training a four-legged pet is much easier. Since dog whistles are usually made from brass alloy, this design is more than durable. According to the principle of operation, the ultrasonic dog whistle can be used to scare away stray dogs, which allows you to ensure the safety of not only yourself, but also your animal.
How to use?
To develop a conditioned reflex, training is necessary over a certain period of time, as well as regular repetitions. In any case, the whistle is an irritant for the animal, so we recommend that in any case, when working with it, you periodically reward your animal with treats. Think about what your dog likes (processed cheese, for example) and stock up on it before training.
To train an animal, it is necessary to alternate signals of different lengths. For example, if you want to tell your dog to come to you, it is better to use a long signal. If you want her to follow the "down" command, train her to do so with a short burst of sound. In this regard, everything depends on your desires. When you walk your pet outside, the leash must be extended to its full length.
In practice, experienced breeders recommend using a triple whistle to call your pet. When you have whistled three times while walking your dog on a leash, stop and pull the leash towards you. This way you let the animal know that you want it to come to you. The corresponding actions must be repeated at least three times, the more the better. The tone of the signal can be changed until you understand which one is the animal’s favorite.
When the dog has fixed the commands, you should remove the leash and try calling him with one whistle.
Ultrasonic emitters in microcontroller circuits
Ultrasound is elastic acoustic waves, inaudible to humans, whose frequency exceeds 20 kHz. It is customary to distinguish between low-frequency (20...100 kHz), mid-frequency (0.1...10 MHz) and high-frequency (more than 10 MHz) ultrasonic vibrations. Despite kilo megahertz, ultrasonic waves should not be confused with radio waves and radio frequencies. These are completely different things!
By its physical nature, ultrasound is no different from ordinary audible sound. The frequency boundary between sound and ultrasonic waves is arbitrary; it is determined by the subjective properties of human hearing. For reference, high-frequency vibrations are well felt by animals (including domestic ones), and for bats and dolphins they are vital.
Ultrasound, due to its short wavelength, travels well in liquids and solids. For example, ultrasonic waves in water are attenuated approximately 1000 times less than in air. This leads to the main areas of their application: sonar, non-destructive testing of products, “sound vision”, molecular and quantum acoustics.
To generate ultrasonic vibrations, the following types of emitters (ultrasonic transducer) are used:
• piezoceramic (piezo);
• electrostatic (electrostatic);
• electromagnetic (electromagnetic).
For the latter option, even ordinary high-frequency audio loudspeakers (in slang “tweeters”) are suitable, which have sufficient efficiency to generate signals in the near ultrasonic range of 20...40 kHz.
Piezoceramic ultrasonic emitters (Table 2.10) are produced, as a rule, in pairs with frequency-matched piezo receivers. Typical parameters of an “ultrasonic tandem”: resonance frequency 37...45 kHz, sound pressure level at a distance of 30 cm - 95...105 dB(A), operating voltage 12...60 V, capacitance 1000...3000 pF, transmitter output impedance 200...500 Ohm , receiver input impedance 10…30 kOhm.
Table 2.10. Parameters of ultrasonic emitters
It is recommended to apply not unipolar, but multipolar pulses to the plates of ultrasonic piezo emitters, i.e. during pauses, generate a voltage of reverse polarity. This contributes to accelerated discharge of the equivalent emitter capacity and increased performance.
In Fig. 2.53, a...l shows diagrams for connecting ultrasonic emitters to MK. To form multipolar pulses, transistor bridges and isolation transformers are widely used. If you reduce the generation frequency, then the given circuits will fit “one to one” for the audible range, i.e. for the previously discussed piezoceramic sound emitters.
Rice. 2.53. Diagrams for connecting ultrasonic emitters to MK (beginning):
a) smoothing the signal shape supplied to the ultrasonic emitter BQ1 using inductor L1. Resistor R1 regulates the amplitude;
b) transistors VT1, VT2 alternately open with short pulses from MK. For reliability, you should choose transistors with a large permissible collector current so that they do not fail with low ohmic resistance of the inductor L1\
c) capacitor C1 differentiates the signal and eliminates the DC component, which allows you to connect the ultrasonic piezo emitter BQ1 to a bipolar power source;
d) low-power ultrasonic transceiver. The divider R1, R2 determines the operating point of the ADC MK when receiving a signal and the amplitude of the output pulses when transmitting a signal;
e) ultrasonic rangefinder transceiver. Pulse frequency 36...465 kHz, voltage at the emitter BQ1 50...100 V (the maximum is selected by capacitor C3). Diodes VD1, VD2 limit the signal to the receiver. Transformer 77 contains 15 turns of PEV-0.3 wire in windings I and II, and 100...200 turns of PEV-0.08 in winding III (ring M2000HM K10x6x5); ABOUT
About Fig. 2.53. Diagrams for connecting ultrasonic emitters to MK (continued):
f) the use of the DD1 logic chip eliminates in hardware the simultaneous opening of transistors of one arm. Pulse noise that occurs in the power circuit due to non-simultaneous switching of inverters DD1.l...DD13 and the spread of the current-voltage characteristics of transistors is eliminated by the filter L /, C1. Diodes VD1... VD4 are installed if the audio HF speaker BA1 (10GD-35, 6GD-13, 6GDV-4) is replaced with a more powerful ultrasonic piezo emitter;
g) increasing the power of the BQ1 emitter using a voltage doubler on the DD1 chip and increased power supply +9...+ 12 V. Transistor VT1 matches the logical levels;
h) an increase in the voltage amplitude at the BQJ emitter occurs due to the increased supply voltage +9 V and the accumulation of energy in the inductor L1\
i) field-effect transistors K77, VT2 (replacement for IRF7831) reduce energy losses during switching. Resistors R1, R2 prevent the transistors from opening when MK is restarted; ABOUT
About Fig. 2.53. Diagrams for connecting ultrasonic emitters to MK (end):
j) the ultrasonic echolocator operates at a frequency of 40 kHz and generates pulses with a duration of 0.4 ms. The signal amplitude on the BQ1 piezo emitter (Murata) reaches 160 V. The inductance of the secondary winding of transformer T1, together with the capacitance of the BQ1 piezo emitter, forms an oscillatory circuit tuned to a frequency close to 40 kHz. The inductance of the primary winding of transformer T1 is 7.1 MK H, the secondary winding is 146 MK H, quality factor Q > 80;
k) ultrasonic hydroionizer operates at a frequency of 1.8…2 MHz. Transformer T1 is wound on three 50BH K20x 10x5 cores. Windings I and II each contain 4 turns of PEV-0.3 wire folded in three, winding III contains 12 turns of PEV-0.3 wire. Coil L1 contains 5 turns of PEV-0.8 wire on a mandrel with a diameter of 8 mm with a pitch of 1 mm. The BQ1 emitter has a diameter of 30 mm (PZT piezoceramics). Resistor R1 reduces voltage surges at the drain of VT1.
Source: Ryumik, S.M., 1000 and one microcontroller circuit. Vol. 2 / S. M. Ryumik. - M.: LR Dodeka-XX1, 2011. - 400 pp.: ill. + CD. — (Series “Programmable Systems”).
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What are they?
Next we will talk about what types of whistles there are.
Designs and manufacturers
Today, dog breeders use one of two types of whistles with different designs:
- The first type and the simplest is standard. Standard accessories are not fundamentally different from those used by the police or a referee on a football field. The cost of such an attribute is minimal, but it has practically no capabilities. The standard accessory allows you to emit only one signal, and you can only change it by volume level. Today, such accessories are considered obsolete.
- Models with adjustable tone. Such devices allow you to transmit a variety of signals to your dog with adjustable tones.
Sorry, there are no surveys available at this time.
As for manufacturers, the most popular products today are:
Ultrasonic whistle
The ultrasonic accessory is considered one of the innovative developments. It allows you to produce high-frequency sounds that can only be heard by four-legged pets. In this case, your signals will not distract people, and they will help the dog even more, since for him they stand out against the background of other sounds.
Imitation pepper spray
The idea is to carry a powder or liquid with you that is easy to spray around you. The best solution is a small plastic bottle (0.33 l) with a sports nozzle or sippy cup. They are closed at the top with a hinged cap - easy to fasten, easy to open.
The first method is with pepper:
- We take a bottle with a sports nozzle (it snaps tightly so that the liquid does not spill in a backpack or bag).
- Fill with table vinegar.
- Season with 1 tsp. black or red ground pepper.
Master class on making an ultrasonic whistle with your own hands
We will tell you later how to make such an attribute with your own hands. To do this, you only need a sharp knife and a willow twig up to 25 cm long. Its thickness should be at least the thickness of your thumb.
This is what a dog whistle made from a willow branch looks like
Stages
- Take a branch and cut one end with a knife at an angle of 45 degrees. You will whistle on the sharp side, so this part can be shortened a little for easier use.
- The next stage will be the most critical, since you will need to create the desired sound frequency. You need to make a small hole on top of the willow stick, in which case you will also need a knife. The hole should be small to ensure the most optimal sound from the accessory.
- Next, we begin to remove the crust from the branch. Take the future whistle in such a way that the part with which you will blow is in front of you. Measure about 10 centimeters and make a small notch in a straight line. After this, the crust should be cut along the entire diameter of the branch. When this is done, start tapping the bark with the back, that is, the blunt side of the knife blade, to make it easier to remove. But it is better not to damage the bark, since it will be useful to you later.
- When the bark is removed, a groove should be cut out on the remaining part. Please note here - the deeper this groove is, the deeper the whistle itself will be. In addition, a small incision should be made in the bark above the groove.
- Now you need to moisten this part of the branch with plain water. After this, insert it into the crust that was removed earlier.
Thus, the dog training whistle is ready. Wait until the twig dries and swells to make the device more durable. We will not explain how to use this attribute; everything is clear here. We hope our material helped you make your own whistle.
>Video “Dog’s reaction to the sound of a whistle”
How a four-legged pet reacts to the sound of a whistle - watch the video.
How does it work
The device creates acoustic vibrations, which can be compared to the sound signals emitted by the tip of a knife when an air flow is directed at it. The role of the tip is played by a cylindrical resonant cavity, and the gas passed under high pressure contributes to the emergence of sound vibrations, the frequency of which depends on the size of the nozzle itself and the resonant cavity.
Most models of ultrasonic whistles have a frequency of 170 kHz. It must be said that the human ear perceives the sound range ranging from 16 to 20,000 Hz, but the dog's ear is more sensitive.
A person cannot hear the sound produced by the device, but a dog can recognize it at a distance of 450 m.
The device is compact, light in weight, and the training process with its help is simple. The material used is nickel-plated brass, which gives the device strength and durability. For ease of wearing there is a fastening ring. Today you can find devices on sale in which you can change the tone and sound frequency. In particular, change the training mode to the repelling mode. Thus, you can protect yourself and your loved ones, as well as your beloved pet, from a pack of stray dogs.
How to use
Many people are interested in how to properly use an ultrasonic whistle?
It takes time and repeated repetition to develop a conditioned reflex. Moreover, sound as a conditioned stimulus should always precede the unconditional stimulus, that is, a treat. It is necessary to alternate signals of different lengths. For example, to teach calling, the “come to me” command, emit a long series of signals, and for the dog to remember the “sit” command, produce a series of short consecutive signals.
When you go for a walk with your animal, loosen the leash to the maximum possible length and use an ultrasonic whistle to call the dogs, blowing it three times. Stop and pull the leash towards you, letting your pet know that you are calling him to you. Secure the result by repeating these steps 5 times. If necessary, you can change the tone of the whistle, choosing the most optimal one for your pet. Having consolidated the behavior reflex, you can try to let the dog off the leash and force it to approach only with the help of a whistle.
To scare away dogs using an ultrasonic whistle, it is recommended to switch the device to the appropriate mode and point it at the object, holding the button pressed for 3-6 seconds. As practice shows, animals begin to react to it differently: some tuck their tails and run away, others whine and back away. It may happen that the repellent device does not work. In this case, the cause can be sought either in dead batteries or in the animal’s weakened hearing.
How to make it yourself
You can also make a dog whistle with your own hands. To do this, you only need a small willow branch 25 cm long and slightly thicker than the thickness of your thumb.
Stages of making a whistle with your own hands:
- One end of the branch must be cut at an angle of 45 degrees. The sharp part of the resulting corner can be shortened slightly for ease of use, since it is from this side that you plan to whistle;
- To create the required sound frequency, a small hole must be made on top of such a whistle. To do this, use a sharp knife. A small hole will provide a better whistle sound;
- Now you need to remove the bark from the branch. To do this, you need to step back approximately 10 cm from the edge where you plan to blow and cut the bark in a straight line. Then, it must be cut to diameter. After making the cut, start tapping the bark with the blunt side of the knife: this will make it easier to remove. However, the integrity of the bark must be preserved, since it will still be useful;
- On the part left without bark, you need to cut a groove. It can be made deeper - then the whistle will also be deep. Make a small cut in the bark above the groove;
- Wet this part of the whistle with water and insert it into the previously removed bark.
Everyone understands how to use such a whistle. You can also make a good ultrasonic whistle for scaring dogs with your own hands from a regular stun gun.
After all, dogs are afraid not only of sharp sounds, but also of bright flashes of light and the smell of ozone. And this device cracks loudly and sparkles brightly, and even emits ozone.
Types of repellers
Technologies do not stand still. Various devices and devices are replacing improvised materials. In order to avoid a collision with an angry animal, there are special dog repellers, which come in different types:
- Ultrasonic;
- Electronic;
- Gas;
- Stationary.
Ultrasonic repellers are the most effective today, as they emit a strong ultrasonic signal that is completely safe for humans. But animal hearing is different from human hearing, so the right frequency can scare away different animals.
Electrical devices are represented by stun guns, which, among other things, also produce an unpleasant sound for dogs, as well as the smell of ozone.
Ultrasonic dog repeller
Gas cans can be used at a distance of one to one and a half meters from animals. But here it is important to choose the right gas, because certain substances do not have any effect on dogs.
Stationary repellers operate on the principle of ultrasound, which can protect your home area from visiting various animals. Having directed them to a certain place, it immediately becomes undesirable for dogs to visit. Another plus is that their frequency is constantly changing, which avoids addiction.
Note! Another small variety is the ultrasonic whistle. However, users note its low effectiveness.
Pugach-explosive
In addition to the terrible stench, dogs are scared away by loud noises (they also have an effect on people, but animals have even finer hearing). The advantage is that no animals will be harmed, so your conscience will be absolutely clear.
Instructions:
- We wrap the firecracker in cardboard so that about 8 cm remains from the top of the tube to the fuse.
- We glue strips of sulfur from a box of matches onto the wall inside the pipe.
- We collect the matches into a sheaf and fasten them with a rubber band.
- We put them in the tube, heads down, but so that they do not touch the fuse.
How it works: if dogs attack, you need to hit the matches with force, they will strike a strip glued inside the cardboard tube and light the firecracker. Throw it under the dogs' paws. The noise and fire will make the dogs forget how to bite.
Important Do not rely on smartphone apps that claim to generate ultrasound. The phone speaker is too weak for such frequencies - the scarecrow will not work.
Operating principle of an ultrasonic dog repeller
The basis of any ultrasonic device is based on special noise waves that can be detected by the animal’s ear. While humans' perception is limited to sounds up to 20 kHz, dogs are able to perceive sounds up to 40 kHz. Basically, ultrasonic devices produce sound with a frequency of 116 decibels.
When the device is turned on, it operates at a distance of up to 30 meters. The greatest efficiency is achieved at a short distance. Such a mechanism is capable of causing animals to flee or keep a distance of 10 meters.
How to choose the right device?
When choosing an ultrasound device, you need to be guided by several parameters. First of all, depending on the type of mechanism, you need to pay attention to the frequency.
Let us repeat that a dog’s hearing is stronger than a human’s, so a good repeller should operate at a frequency of 20 to 30 kHz. The average of quality devices is from 24.3 kHz. Naturally, stationary devices are much more powerful, because they create a sound load of more than a hundred dB. Compact options are much weaker, but individual copies can create sound with a volume of up to 250 dB.
Operating principle of an ultrasonic dog repeller
It is important that the pocket repeller works at a distance of 10 meters. This will help avoid the approach of animals. Devices that start working at a shorter distance are best suited for children.
The choice of range for stationary models should be based on the size of the area that needs to be protected. So, there are options that cover the territory of a small yard, and there are also those that work for several hundred square meters.
Note! As a rule, the battery charge in repellers is enough for 1000 uses (depending on the model). The batteries used are Krona, AA or AAA batteries. Stationary models operate from mains power (220 V) or solar panels.
Of course, it is worth paying attention to some additional features. For example, some devices may be equipped with a strong sound siren, which creates additional security and can also attract the attention of other people in the event of an attack.
The most effective additional feature is a light flash that blinds a dog that comes close.
Advantages and disadvantages
The undoubted advantage of all repellent devices is their safety for humans, as well as:
- Instant exposure of an animal to an ultrasonic or electronic device.
- Convenient to use, just remove the pocket from the case, or press the button found on all modern devices.
- High efficiency of devices.
- The efficiency of the devices regardless of the time of day and weather conditions.
- Compact dimensions of protective devices.
- No skill required to use.
- They begin to act at a distance of 25-30 meters.
