Electroshock protection. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Security and safety. Personal safety

 Comments on the article

I want to bring to your attention an electroshock means of self-defense. The product is very effective, including psychologically.

The basis of the device is a DC voltage converter (Fig. 1). At the output of the device, I used a multiplier on KTs-106 diodes and 220 pF x 10 V capacitors. 10 D-0,55 batteries are used as power. With smaller ones, the result is slightly worse. Batteries "Krona" or "Korund" can also be used. It is important to have 9-12 volts. Batteries are convenient only because they can be charged.

Ris.1

A very important element is the transformer, which I made from a ferrite core (a ferrite rod from a radio receiver with a diameter of 8 mm), but a ferrite transformer from TVS worked more efficiently - I made a bar from a "P"-shaped one.

I took the rules for winding a high-voltage winding from the Radio magazine for 1992 ("Electric Match") - I laid insulation through every thousand turns. For inter-turn insulation, I used FUM tape (fluoroplat). In my opinion, other materials are less reliable. Experimenting, I tried electrical tape, mica, used PEL-SHO wire. The transformer did not serve long - the windings were "flashed".

The case was made from a plastic box of suitable sizes - plastic packaging from an electric soldering iron. Original dimensions: 190 x 50 x 40 mm (see photo). In the case, I made plastic partitions between the transformer and the multiplier, as well as between the electrodes on the soldering side - precautions to avoid the passage of a spark inside the circuit (case), which also protects the transformer.

From the outer part, under the electrodes, I placed small "antennae" made of brass to reduce the distance between the electrodes - a discharge is formed between them. In my design, the distance between the electrodes is 30 mm, and the length of the crown is 20 mm. A spark is also formed without a "mustache" - between the electrodes, but there is a danger of breakdown of the transformer, its formation inside the case. I spied the idea of ​​"mustache" on "branded" models.

Fig.2 (click to enlarge)

In order to avoid self-switching when worn, it is more advisable to use a slide-type switch.

I want to warn radio amateurs about the need for careful handling of the product both during the design and commissioning period, and with the finished device. Remember that it is directed against a bully, a criminal, but, at the same time, against a person. Exceeding the limits of necessary defense is punishable by law.

Author: A.Vorobiev, Kursk

Refinement of electroshock protective equipment

I want to propose a winding technology for a high-voltage transformer for an electric shock circuit from A. Vorobyov's article [1].

The frame is made of a 50 mm felt-tip pen, which accurately fits a ferrite core with a diameter of 8 mm. Cheeks measuring 40 x 40 mm are cut out of ordinary plastic and glued with dichloroethane. For insulation, instead of a scarce fluoroplastic, interelectrode insulation from a capacitor from a fluorescent lamp 4 μF x 300 V 0,035 mm thick was used, which I pre-cut exactly to the width of the frame. When powered by Krona, the high-voltage winding contains 10 turns of PEV-000 wire with a diameter of 2 mm. After winding every three layers, I smeared the winding with a wide brush with epoxy resin, slightly diluted with acetone, so that the resin was not very viscous, and laid the insulation in 0,15 layers. Further, without waiting for hardening, he continued winding. Between the high-voltage and other windings there is insulation - 2 layers with epoxy. The finished transformer is wrapped with one layer of fiberglass and filled with resin. The conclusions of the high-voltage winding must be brought out through the holes in the cheeks at the beginning and end of the winding. When working for 6 minutes with the maximum divorced contacts, the transformer did not break through.

I replaced the KT818 transistors with KT816 with any letter and small plate heatsinks, which reduced the weight and size of the device. Diodes KTs106 - preferably with the letters B, G. The size of the case when powered by the "Krona" without taking into account the "whiskers" is -135 x 58 x 36 mm. Weight - about 300 grams.

Literature

1. A. Vorobyov. Electroshock protection. Radio amateur. - 1994. - No. 3. - P.46.

Author: A. Antsiferov, Moscow; Publication: N. Bolshakov, rf.atnn.ru

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