Electromine for rats. Encyclopedia of radio electronics and electrical engineering

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

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Many people keep various pets, communication with which brings a lot of pleasant moments for both children and adults.

However, there are also animals that also constantly live next to a person and often visit his home (for example, mice, rats). But at the same time, they are uninvited and even harmful guests, since they are considered (and, probably, not without reason) to be carriers of pathogens of various dangerous infections.

It is hardly possible to wean them from going "on a visit without an invitation" the desire to profit from them is stronger than fear. And then there is only one way out, no matter how scary it sounds - to destroy them.

Usually, poisonous top dressings or all kinds of traps and traps are used for this. These methods have been repeatedly tested, widespread, but not always effective. After all, it is not for nothing that rats are considered one of the most intelligent animals, they smell poisoned food and do not take it, and traps and traps simply bypass or take bait from them with such caution and dexterity that these mechanisms do not even work.

In addition, if rodents sometimes fall into traps and traps or eat poisonous top dressing, they will face a painful death, which, in general, is inhumane even in relation to such harmful creatures.

About ten years ago I worked as a laboratory assistant in the physics classroom of a high school. And a large gray rat got into it from the basement through the gap between the floor and the wall. Several times she came, not being afraid, even in my presence and very reluctantly left when I launched an unbreakable object that came to hand at her: either a rubber pear or a cardboard box

I tried to use almost all traditional means against it, but to no avail.

I had to think about how to outsmart her. Finally figured it out.

Since pre-perestroika times, when the school radio engineering circle successfully worked and won many victories in radio sports, there was plenty of all kinds of "electronic trash" in the laboratory. From it, I decided to make an "electromine fence" for the rat, powered by a household AC electrical network. Leaving the device energized at night unattended, contrary to the rules of electrical and fire safety, was a risky business. Then I decided to design another improved device that operates from an electric charge accumulated in a sufficiently powerful pair (battery) of capacitors. does not emit any alarming smells and sounds.

The device consisted of a pair of plates of one-sided foil-coated 1-mm getinaks, turned up with a conductive layer. The strips can also be made from ordinary sheet metal, but only if the device for use is located on a dry electrically insulating base, for example, on a wooden floor. At the ends of the strips, they were fastened with two electrolytic capacitors - they were soldered to each plate of the same name, thus obtaining a battery of capacitors connected in parallel. I took the capacitors with a nominal value of 50 microfarads x 450 V, so that they had a sufficiently large voltage for a long time to ensure proper lethal force even with a small self-discharge of the battery

Rice. 1. Layout of the device: 1 - plate (one-sided foil getinax s1, 2 pcs); 2 - electrolytic capacitor (2 pcs), 3 - bit resistor R1. 4 - socket, 5 - load connection plug, 6 - rectifier diodes, 7 - charging resistor R2, 8 - mains plug with wire.=

Rice. 2. Schematic diagram of "electromines"

The length of the plates was determined by the width of the track, which was supposed to cover the "electromine" on the possible path of the animal and was about 500 mm. The width of the plates was about 100 mm, but this is perhaps the maximum, although it is also inappropriate to make them less than 50 mm - this harmful rodent plates easily and jump over - you can’t refuse a rat in skill and quick wit. The distance between the plates (gap) was small - only about 10 mm, it should only slightly exceed the size of the foot (paw).

In addition to the capacitors, wires from a socket attached to one of them were soldered to the plates. A plug from a simple rectifier consisting of two D226B diodes connected in series was connected to the socket to charge the capacitors. To reduce the current in the charging circuit, a resistance resistor of 8,2 kΩ is connected in front of the diodes. The other ends of the rectifier were connected to a 220V network.

And further. The output of a two-watt resistor with a nominal value of 10 kOhm was soldered to one of the plates. Its other output remained free and hung over the second strip. By pressing the resistor with a non-conductive object, in a few seconds the capacitors could be discharged and the device could be secured.

In the evening, before leaving work, I charged the capacitors of the device using a home-made rectifier almost to the peak voltage of the network (about 300 V). (If there was a suitable power supply, they could be charged to almost the maximum allowable voltage of the capacitors) After that, he installed an electromine near the slot through which the rat came and went.

On the third morning, the "electromine" worked - a defeated enemy lay near the device.

Author: A. Lisov, Ivanovo

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