Megashocker. Encyclopedia of radio electronics and electrical engineering

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

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The idea of ​​creating high efficiency stun gun came to me after testing on myself several similar devices of industrial production. During the tests, it turned out that they deprive the enemy of combat capability only after 4 ... 8 seconds of exposure, and then if you're lucky :). Needless to say, as a result of real use, such a shocker will most likely end up in the back seat of the owner.

Infa: our legislation allows for mere mortals shockers with an output power of not more than 3 J / s (1 J / s = 1 W), at the same time, devices with a power of up to 10 W are allowed for ATC workers. But even 10 watts is not enough to effectively neutralize the enemy; During experiments on volunteers, the Americans became convinced of the extreme inefficiency of shockers with a power of 5 ... 7 W, and decided to create a device that would specifically extinguish the enemy. Such a device was created: "ADVANCED TASER M26"(one of the modifications of the "AirTaser" company of the same name). The device was created using EMD technology, or, more simply, it has an increased output power. Specifically, 26 watts (as they say, "feel the difference" :)). In general, there is another model of this device - M18, with a power of 18 watts. This is due to the fact that the taser is a remote shocker: when you press the trigger, two probes are fired from the cartridge inserted into the front of the device, followed by wires. The probes do not fly parallel to each other, but diverge under a small angle, due to which at the optimal distance (2...3 m) the distance between them becomes 20...30 cm. .

At first I made stun guns, similar in efficiency to industrial ones (out of ignorance :). But when I found out the information given above, I decided to develop a REAL stun gun worthy of being called a WEAPON of self-defense. By the way, in addition to stun guns, there are also stun guns, but they don’t rule at all, because they paralyze muscles only in the contact zone, and the effect is not achieved immediately, even with high power.

The output parameters of the MegaShocker are partially borrowed from the "ADVANCED TASER M26". According to available data, the device generates pulses with a repetition rate of 15 ... 18 Hz and an energy of 1,75J at a voltage of 50Kv (because the lower the voltage, the higher the current at the same power). Since the MegaShocker is still a contact device, and also out of concern for one's own health :), it was decided to make the pulse energy equal to 2 ... 2,4 J, and their repetition rate - 20 ... 30 Hz. This is at a voltage of 35 ... 50 kilovolts and a maximum distance between the electrodes (at least 10 cm).

The scheme, however, turned out to be somewhat complicated, but nevertheless.

(click to enlarge)

Scheme: A control generator (PWM controller) is assembled on the DA1 chip, on transistors Q1, Q2 and transformer T1 - a voltage converter 12v --> 500v. When capacitors C9 and C10 are charged up to 400 ... 500 volts, the threshold node is activated on the elements R13-R14-C11-D4-R15-SCR1, and a current pulse passes through the primary winding T2, the energy of which is calculated by formula 1.2 (E is the energy (J), C - capacitance C9 + C10 (μF), U - voltage (v)). At U \u450d 23v and C \u2,33d 14 uF, the energy will be 6 J. Rezyuk R7 sets the threshold. Capacitor C3 or CXNUMX (depending on the position of switch SXNUMX) - limits the power of the device, otherwise it will tend to infinity, and the circuit will burn out.

Capacitor C6 provides maximum power ("MAX"), C7 - demo ("DEMO"), which allows you to admire the electric discharge without the risk of burning the device and / or draining the battery :) (when you turn on the "DEMO" mode, you must also turn off S4). The capacitance of C6 and C7 is calculated using formula 1.1, or simply selected (for a power of 45 watts at a frequency of 17 KHz, the capacitance will be about 0,02 microfarads). HL1 - a fluorescent lamp (LB4, LB6 or similar (C8 is selected)), placed for disguise - so that the device looks like a tricked-out lantern and does not arouse suspicion among various types of police officers and other personalities (otherwise they can take it away, I had a case - they took it away similar device). Of course, you can do without a lamp. Elements R5-C2 determine the frequency of the generator, with the specified ratings f = ~ 17KHz. Rizuk R11 limits the output voltage, you can do without it at all - just attach R16-C5 to the case. Diode D1 protects the circuit from damage when connected in reverse polarity. A fuse - for every fire-fighting one (for example: if a thread closes somewhere, the battery can explode (there were cases)).

Now for assembling the device: you can assemble the entire device on a breadboard, but it is recommended to solder the pulse circuit (C9-C10-R13-R14-C11-D4-R15-SCR1) by surface mounting, while the wires connecting C9-C10, SCR1 and T2 should be as short as possible. The same applies to elements Q1, Q2, C4 and T1. Transformers T1 and T2 should be located away from each other.

T1 is wound on two ring cores folded together from M2000NM1, size K32*20*6. First, a winding of 3 - 320 turns of PEL 0,25 is wound, turn to turn. Windings 1 and 2 contain 8 turns of PEL 0,8 ... 1,0 each. They are wound simultaneously in two wires, the turns should be evenly distributed over the magnetic circuit.

T2 is wound on a core of transformer plates. The plates must be isolated from each other with a film (paper, adhesive tape, etc.). The core cross-sectional area must be at least 450 square millimeters. First, a winding of 1 - 10 ... 15 turns of PEL wire 1,0 ... 1,2 is wound. Winding 2 contains 1000 ... 1500 turns and is wound in layers turn to turn. Each winding layer is insulated with several layers of adhesive tape or a capacitor film (which can be obtained by breaking the smoothing conder from the LDS lamp. Then it is all filled with epoxy. Attention - the primary winding must be carefully isolate from the secondary!Otherwise, it may turn out to be some kind of filth (the device may fail, or it may shock the owner. switching on, both switches must be rated for a current of at least 1A.

A distinctive feature of the circuit is that everyone can set it up for themselves (in the sense of the enemy :). The output power of the device can be in the range from 30 to 75 watts (doing less than 30, IMHO, is impractical). And more than 75 is just bad, because. with a further increase in power, the efficiency will not be much greater, and the risk will increase significantly. Well, the dimensions of the device will turn out to be a little more.). Output voltage - 35 ... 50 thousand volts. The frequency of discharges should be at least 18 ... 20 per second. The recommended parameters are 40 watts, the energy of a single pulse is 1,75J at a voltage of 40Kv. (if you lower the voltage, you can also reduce the pulse energy, the efficiency will remain the same. 1,75J at 40Kv will be approximately the same as 2,15J at 50Kv. But it is not advisable to make the voltage less than 35 Kv, because then the skin resistance, i.e. current, will interfere in the impulse will be insufficient). The main problem is the power supply. I conducted experiments on the CA1222 battery, casil.ru. This battery is capable of delivering 80 watts of power for some time, but is too big and heavy. You can use some smaller thread (see the link), now I'm thinking about it. The dimensions and weight of the finished shocker are mainly determined by the size / weight of the power source.

Publication: cxem.net

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