It's no secret that homeless, stray, as well as aggressive dogs in our courtyards every day becomes more and more. Thus, we are risking every day to become a victim of the so-called "friends of man." Consequently, it is possible to count only on your strength and achieve science. Below is a diagram of a ultrasonic disfigner of dogs.

Electric circuit diagram.

The effect of the ultrasound repelter is based on the complex effects of ultrasound and outbreaks of light on animals. Ultrasound is not heard for a person, and in dogs he acts in depressingly, causes them a feeling of fear, and they try to leave your road. To increase the power and optimal coordination with the emitter in this scheme, a symmetric cascade with output transformer is applied at the output. On the IS1 C12111EU1 microcircuit, the ultrasound generator with a frequency of 25 kHz is assembled. The generator frequency can be adjusted using a R3 trimmed resistor. At the output of the K1211EU1 microcircuit, two anti-phase signal of the frequency of 25 kHz are obtained which are coming on the output stage on the T1, T2 and TP1 transistors.

Signal form at the output of the K1211EU1 chip1.

The load of the transformer is the KPUS-25T-16T emitter, or a similar to a resonant frequency of 22-25 kHz. For optimal matching, the emitter is connected via choke L1. The D2 LED, connected via a stabilion with a voltage of 5,6V and a sequentially turned on the resistor serves as the discharge indicator of the battery. When the LED burns dim or completely goes out - you need to change the battery. LED D3 device turning on the device. The device setting is to set the frequency of 25 kHz using the R3 resistor and check the pulses on the emitter using an oscilloscope. Upon reaching the resonance of the emitter, the pulse acquires the form of sinusoids and has a maximum amplitude.

The form of the signal on the emitter.

The pulse transformer is wound on a small-sized ferrite core of suitable sizes. Primary winding 2 to 20 turns of PAL0.15 Secondary winding 80 turns of PAL0.15.

Bread board.

To further increase the power (for example, with a stationary version), you can increase the amount of emitters to 5-10 pieces. In this case, the T1 T2 transistors need to be replaced with more powerful IRF 640.

A properly configured ultrasonic rodent repeller deflects the flame of a candle or lighter. When the flame is approached, the candle or lighter goes out.

Ultrasonic Dog repeller is a small compact electronic device that emit sound waves that are not heard for a person, but are well perceived by the sensitive ears of dogs and cats.

The frequency of sound on which such discharges work is from 18 to 25 kHz.

In this article we will tell you how to assemble a dog scarecher with your own hands using the electrical schemes we are.

Dog repeatable circuit for self-assembly.

For the assembly of the first model you need only one microcircuit and five transistors.
The device consists of an ultrasonic generator, the basis of which is a multi-level symmetric vibrator, which can produce rectangular pulses with a frequency of 1.5 Hz.
The second vibrator made of the same details as the first, creates pulses with a frequency of 20 Hz.
The amplitude of these pults every 0.66 seconds increases 4 times.

To create a floating frequency, a node assembled from three resistors, one condenser, transistor (VT1) and two diodes is intended.
The assembly on the VT2-VT4 transistors is designed to enhance the signal, which in its queue enters the Piezocemic Emitter SP-1. The SB-1 button is intended for switching.

The main difference of this device from is that the ultrasound frequency of this device is much lower - from 18 to 25 kHz.
Whereas the instruments for combating rodents of frequency beyond 25 kHz to 80 kHz.

And at the end, we propose to repetition a simple scheme, but a fairly reliable dog repeatant without chips on transistors.

Concept of dog repeatant on transistors.

The power source for this design can be a battery or battery with a voltage of 1.5 volts to 12 volts.
The higher the supply voltage, the more powerful the sound from the emitter.

The frequency of this repeller can be adjusted by the R6 resistor by connecting the oscilloscope or any frequency meter parallel to the R1 resistor.
VD1 diode is used to protect against improper power on (if you accidentally confuse polarity)

Piezo Elevator Any domestic or imported SP-1, ZP-18, ZP-25, etc.

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The problem of stray or aggressive dogs walking without a muzzle is always acute in small cities or certain areas of megacities. Meeting with such an opponent can end for a person very deplorable. In addition to the necessary survege, the surgeon is likely to be required to vaccinate against rabies.

Homemade Ultrasonic Dog Scarf is an excellent alternative to the purchase device. Such a product can be finely configured, performed in a convenient case, to obtain improved performance and reliability for less money.

Dog repeller with his own hands on the mechanics of action is no different from serially produced devices.
With the exception of the main parameter - it is more powerful and works in a larger frequency band.

Using:

• ultrasonic dog repeller reproduces high frequency sound;
• the vibrations unreasonable people act on the organs of the dog's hearing, causing pain, disorientation;
• unlike serial, if a dog repeller makes itself - the device will change the radiation frequency in a wide limit, even more increasing the impact on the dog.

In homemade devices are used enough, so to speak, large-scale approaches to the formation of a strong sound wave. The serial products rarely encounter piezoceramic emitters and speakers with a large diaphragm than the scheme of the ultrasonic dog repeller can boast.

Therefore, a properly configured and neat device - works efficiently, almost with a full guarantee of a positive result.

Homemade Dog Scan is a fairly simple device. If we consider proven and efficient schemes, it is easy to see that they are constructed on simple principles, understandable mechanics of interaction of the main hardware parts.

To make a dog repeller to make himself - do not need to order or search for rare, expensive elements. Most solutions are built on chips and transistors that will not be difficult to purchase at any electronics store.

The basic principle on which the Dog repeller is built with its own hands - the interaction of two oscillatory contours.

It is observed:

• clarity of the formation of the base carrier frequency;
• high output power of the final cascade;
• variation of sound frequency in very wide limits.

Understand how to make a dog repeller - even a person having elementary skills to work with a soldering iron and manufacturing printed circuit boards.

The microcircuits used, transistors and diodes are not related to the micro-dimensional class. Therefore, a powerful dog repeller is easy to do without the use of a microscope, a specialized solder, a soldering station.

Ultrasonic repeller

If you appeal to the experience of radio amateurs, which investigated a lot of serial devices in order to improve the device - on specialized forums it is easy to find two technical solutions.

Both are characterized by high output power, provide for the use of inexpensive, common parts, are simply configured.

One of the options, how to make a dog repeller itself - take advantage of the solution built using the digital chip of the elementary logic K561L7.

For its assembly will be required:

• digital element with 4 logical blocks K561L7;
• type transistors KT3102 (3107)
• the piezo emission, the BF1 class SQ-340L, instead to increase the sound pressure, it is allowed to install a specialized ultrasonic emitter MFC-200.

The principle of operation of the device collected in this scheme is as follows:

1. The first carrier generation circuit is a symmetric multivibrator collected on two of the four logical elements of the chip.
2. At the output of the primary generator is a rectangular signal with a frequency of about 1.5 Hz.
3. The task of the secondary circuit is to form an ultrasonic signal at the base frequency signal. The multivibrator built on the two remaining logical elements of the chip - creates a rectangular signal with a frequency of about 20,000 Hz, which is required every 0.66 seconds.
4. For a roll of speaker or piezoelement - a two-stroke transistor amplifier is intended. Its emitter load and performs a sound emission.

The scheme provides protection measures against feeding, overvoltage, and also - frequency filtering system. This Dog Displayer Electrical Circuit Requires some practical skills of work, as well as fine tuning. But the finished device is very effective, starts with one button.

For those who are unfamiliar with the oscillations of the chip soldering - the dog repeller is designed with his own hands a simple scheme. It has only 13 elements, the key of which is the diode CD503A, simultaneously responsible for the maximum output power and protecting the device from the transfer of power and other emergency modes.

For the assembly will be needed:

• resistors: 5 permanent and one trimmed;
• piezoelectric sound emitter, class ZP-1, ZP-25;
• a pair of common transistors KT361B (3107);
• ceramic capacitors;
• diode protection CD503A;

switch, button - for power supply.

After making a printed circuit board - it remains to accurately install and solder items. It turns out an ultrasonic dog repeller is the most powerful with its own hands, the entire setting of which is reduced to adjusting the resistor to form an optimal frequency.

Wherein:

1. the output power is regulated only by voltage coming from the battery;
2. the limiter acts protective diode. It can be replaced with analogue, with an operating voltage from 5 to 12 V;
3. a variable resistor is responsible for the selection of frequency.

The installed power element is selected in accordance with the used protective diode. For KD503A - Croon 9B is suitable.

How to use dog repeller

When attacking an aggressive dog, it is important that the effect of the device is unexpected and as sharp as possible. Therefore, you should not panic before.

• get the device from pocket or bag;
• let the dog at a distance of at least a meter;
• send on the animal sound emitter of the repeller;
• press the start button.

At the time of stunning and short-term retreat - it is worth continuing to direct the discourability of the repeller. However, if the animal goes back to the meter and more - the device should be disabled. It is worth understanding that the sound pressure begins to fall sharply with the increase in distance. Therefore, the effect of the secondary switching on the repeller will be much stronger if the dog is a little bit off, retreating without the effects of a weak ultrasonic signal.

It is not necessary to targe the line of radiation of sound directly in the ear of the animal. The oscillations are perfectly applied to the bones of the skull, so the repeller is sufficient to aim in the head of the animal. We lose time, choosing some optimal direction - not necessarily.

Conclusion

Understanding how to make a dog repeller and having some skills to work with a soldering iron - it is not difficult to create a device that will be much more powerful and more efficiently serially proposed models.

It should be noted one feature of the homemade, which is able to serve as excellent advertising. Dog repeller scheme - provides for the use of powerful, simple, inexpensive and common components.

Failure tolerance and reliability of the device collected by their own hands - depends only on the accuracy of the radio amateur. In this case, the efficiency of the device is higher, and the price is incomparably lower than that of the proposed serial models of similar output power.