Floating ultrasound for rodent protection. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Home, household, hobby

 Comments on the article

Protecting your home and garden from small pests and insects is still relevant today. Various industrial "repeller" devices are commercially available, but a radio amateur with an average level of training can make the same device. Unlike many schemes of similar devices, the one proposed below is quite original. Known schemes are based on an ultrasonic frequency generator (UZCH), "loaded" on a piezoelectric capsule. The frequency of these generators can be tuned (adjusted by changing the ratings of the RC circuit), but it does not change during the operation of the device, and therefore the generator. That is, no matter what rodents, insects, birds or animals the UHF generator is “programmed” for (all of the listed creatures are afraid of discomfort from pulses of a certain frequency), over time the device ceases to be effective due to the habituation effect that occurs in rodents or insects.

In the development considered below, this drawback is absent because during the active operation of the device, the generator frequency varies over a wide range. Due to this, the proposed device can be used universally for many living beings, whose presence is undesirable in the areas, and even more so in the house.

Ultrasonic vibrations with a frequency of 100 kHz act depressingly on rats, mice and other small rodents, and vibrations of 22 - 40 kHz cannot stand dogs and cats.

Consider the electrical circuit of the repellent device.

The device is effective on an area up to 10 m2. If it is necessary to increase the impact zone, then it is necessary to turn on the piezoelectric capsule through a powerful amplifier, which can be implemented according to a transistor circuit.

(click to enlarge)

On the elements DD1.1 and DD1.2, an infra-low frequency oscillation generator (INF) is assembled, "loaded" on the transistor VT1. This transistor acts as a current amplifier and at the same time an electronic key that controls the optocoupler U1. As an optocoupler, a thyristor optocoupler is used, which acts as a controlled key.

The shape of the pulses at the output of this generator is rectangular, therefore, the transistor VT1, depending on the front of the pulse, periodically slowly opens and closes (with the frequency of the INCH generator). Optocoupler U1, included in the collector circuit of the transistor VT1, smoothly changes the time constant of the second generator, implemented on the elements DD2.1 and DD2.2. Therefore, the frequency range of the second generator varies over a wide range: 20 -80 kHz.

Elements DD2.3 and DD2.4 are included in the inverter circuit in order to be able to "rock" the amplifier on transistors VT2 - VT5. At the output of the amplifier, several similar piezoelectric elements HA1 -HA4 are included. Their total number is unlimited and can reach 6-8 in this scheme. The more piezoelectric elements, the more area can be protected from the invasion of rodents and the like. When more than 4 piezoelectric elements are connected to the output of the device, transistors VT2 - VT4 must be installed on different heat sinks (since the collectors of these transistors are combined with their case).

As HA1, it will be necessary to use piezoelectric elements with a resonant frequency of 20 - 80 kHz. At resonance, one element consumes a current of the order of 30 - 50 mA, so the power source for this design must be of the appropriate power, stabilized, with an output voltage in the range of 10 - 15 V.

The device does not need to be adjusted and, with serviceable parts, it starts working immediately.

The variable resistor R3 sets the range within which the device will change the oscillation frequency of the generator.

It is easy to check if the device is working. Since the human ear (taking into account individual characteristics) fixes the lower frequency limit of the UHF generator in the region of 16 - 20 kHz, a properly working device will periodically be "heard" by the human ear for several moments. It will be a quiet sound, similar to a whistle. Then the sound will again move to a higher vibration frequency, which negatively affects pests.

About details

Transistor VT1 - low-power silicon. Instead of what is indicated on the diagram, you can use KT503, KT312, KT315, 2N5551, BC547 with any letter index. Optocoupler U1 can be replaced by AOU10Z with indices B, C or similar.

Piezoelectric capsules - type HC0903A, HCM1206X, SLN and the like are designed for a resonant frequency of 20 - 80 kHz.

Oxide capacitors - type K50-29. Non-polar capacitor C1 - type KM6B, K10-17 or trivial. It can also be made up (appropriately) of two 2 uF oxide capacitors, connected in series with positive (or negative) plates to each other.

All fixed resistors are of the MLT-0,25 type. Variable resistor R3 - type SPO-1, SDR-1VB or similar.

Author: E.Petrovich

See other articles Section Home, household, hobby.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive Apple iPod Family 22.10.2010 On September 1, Apple held a large-scale presentation, in which it introduced updated models of the iPod lines. The latest iPod Shuffle players have added hardware control and retained voice control. The iPod nano no longer has a traditional wheel, but it has a full touch display (1,54 inches, 240x240, multi-touch support). The device has become 46% more compact and 42% lighter. iPod touch "lost weight" to 7,2 mm, but significantly improved its filling and functionality. He received the same processor (Apple A4) and screen (Retina) as the iPhone 4, and in addition, he got two cameras and a gyroscope.

Other interesting news:

▪ Samsung eUFS 3.1 512GB Fast Flash Memory

▪ allergy to money

▪ Minicomputers Gigabyte Brix

▪ NB3N3020 - new frequency multiplier

▪ The brain predicts the future

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Chargers, accumulators, batteries. Article selection

▪ article Where the rock of events takes us. Popular expression

▪ article Who loses horns? Detailed answer

▪ article Removing and installing car wheels. Standard instruction on labor protection

▪ article Double balanced modulator. Encyclopedia of radio electronics and electrical engineering

▪ article A simple starter charger. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024