Do-it-yourself police shocker flashlight repair

An electroshock device (stun gun), abbreviated as ESHU, is a publicly available special means of protection against offenders and an effective means of scaring off and protecting animals, such as dogs, when attacked.

Shockers on the market are presented in a wide range, but the principle of operation of all models is the same. They differ from each other only in the magnitude of the voltage on the electrodes, the power of the arc, reliability and the availability of additional services, such as a flashlight and built-in charger, and others.

The main consumer parameters of any shocker are the open circuit voltage on the spark gap electrodes and the arc power. According to GOST R 50940-96 “Electroshock devices. General specifications. " Shockers by voltage on the electrodes are divided into five groups. The first is from 70 to 90 kV, the second is from 45 to 70 kV, the third is from 20 to 45 kV, the fourth is from 12 to 20 kV and the fifth is up to 12 kV inclusive. And according to the power of the arc impact - into three types. The first is from 2 to 3 watts, the second is from 1 to 2 watts and the third is from 0.3 to 1 watts.

Depending on the combination of the type and group possessed by a specific model of the stun gun, according to GOST R 50940-96, it can be attributed to one of five classes. To which class the stun gun corresponds, it is easy to find out from the table below. For example, a stun gun of the second type of the third group belongs to the third class.

First class stun guns are very powerful and expensive, they are weapons for special forces. For personal protection, a second or third class shocker is quite suitable. Shockers of the fourth and fifth classes are more suitable for intimidating the attacker than for real protection.

Video (click to play).

Attention, if you decide to buy a stun gun, then consider the following. For a temporary paralysis of the physical strength of an attacker, the time of continuous impact of a shock discharge on his body should be about 3 seconds. With a shorter exposure time, you will only anger the offender and then it is quite possible that you yourself will fall under the influence of your own shocker. It is permissible to use a shocker only if you are sure that you can keep the shocker pressed by the electrodes to the opponent's body for three seconds.

I had to repair a JSJ-704 type stun gun with a flashlight. The appearance of this shocker is shown in the photo above. According to external signs, the shocker was serviceable, the LED indicating the battery charge was on when the shocker was connected to the network. The flashlight worked, the ready-to-discharge LED was also on, but when the discharge button was pressed, nothing happened. It became obvious that the fault lies in the high-voltage converter circuit.

All stun guns, regardless of model and manufacturer, work on the same principle. Voltage from a battery or batteries is fed to a high frequency generator, which converts DC voltage into AC voltage. An alternating voltage is applied to a step-up high-voltage transformer, the secondary winding of which is connected directly or through a voltage multiplier to the external electrodes of the shocker. When the stun gun is turned on, a powerful electric arc arises between the electrodes.

The photo shows the electrical schematic diagram of the JSJ-704 stun gun.

The circuit consists of several functional units. The GB1 battery charger is assembled on the capacitor C1 and the diode bridge VD1. C1 limits the charge current to 80 mA, the diode bridge rectifies the voltage. Resistor R1 serves to discharge the capacitor C1 through it after disconnecting the shocker from the mains voltage to prevent the discharge of the capacitor through the human body when accidentally touching the terminals of the plug.

The HL1 LED serves to indicate the connection of the shocker to the 220 V electrical network, R2 serves to limit the current flowing through the HL1. This part of the circuit does not directly participate in the work of the shocker and serves only to charge the battery and may be absent in models of other shockers. Charging time for a fully discharged battery is 15 hours.

LED HL2 with current limiting resistor R3 is a flashlight. The flashlight turns on when the S1 switch slider is moved to the middle position. The flashlight is placed between the shock arrestor and is convenient in the dark. In some models, shockers may be absent.

The HL3 LED with a current-limiting resistor R4 are used to indicate the inclusion of the shocker in the ready-to-use mode. To prevent accidental switching on to the discharge mode, triple protection is provided in the form of three switches. In order for a discharge to appear between the electrodes, you must first move the slide switch S1 (located next to the round button) to the extreme right position, then the second slide switch S2 (located next to the socket for connecting the shocker to the mains for charging) to the right position, then the HL3 LED will light up, informing that the shocker is ready to discharge. And only after that, when you press the round pusher of the return button S3 "Start" itself, a discharge in the form of a blue arc will appear between the electrodes.

Due to the fact that the halves of the shocker body were fastened together with four self-tapping screws, it was not difficult to disassemble it.

The heads of three self-tapping screws were clearly visible in the countersunk holes, and the fourth was sealed with a label. After unscrewing all the screws, the halves are easily detached.

After removing the cover, the following picture was revealed. As you can see in the photo, the installation of the stun gun parts is carried out in a hinged way, there is no printed circuit board. The high-voltage converter is filled with a compound. This is good, as it is protected from moisture and therefore more reliable, but it is bad that the converter is not repairable. It should be noted that although the shocker is also made in China, all the soldering is performed with high quality and reliability.

Attention, when repairing a stun gun, extreme care must be taken so as not to accidentally touch the discharge electrodes while the stun gun is operating. Killing will not kill, but unpleasant sensations are guaranteed.

The repair of any electronic device begins with checking the power supply. Therefore, the first step is to check the performance of the battery or batteries. The check can be done with a multimeter. If the shocker runs on batteries, then in addition to their serviceability, you need to check the condition of the contacts in the battery compartment. It happens that they oxidize or weaken their spring properties.

When the "Start" button was pressed while the "Readiness" indicator was on, the discharge did not occur, but the voltage at the battery terminals, equal to 7.2 V, did not drop. Therefore, it is not about the battery. I checked the voltage by pressing the "Start" button on the input terminals of the High Voltage Converter, it dropped to several volts. This voltage was enough for the HL3 LED to glow, but not enough for the converter to work.

Therefore, the fault was in poor contact of one of the switches, S1, S2 or S3. I short-circuited the S2 conclusions with a jumper and the stun gun started working. To restore the shocker's performance, you need to clean or replace the faulty switch.

If the stun gun has not been turned on for a long time, then in some types of switches the contacts are oxidized and often to restore their performance, it is enough to turn it on and off twenty times. Then the oxide will be erased, and the switch will work again.

But since the shocker was opened and there was access to the contacts in the faulty switch, the wires were soldered from the switch and the contacts were cleaned with a brush moistened with alcohol. During the time when the contacts were wet with alcohol, the switch was switched intensively. After soldering back to the wire terminals, the shocker's work was restored.As you can see, we managed to repair the stun gun with our own hands, spending very little time.

Here is a video demonstrating the operation of the stun gun after repair. As you can see, a rather powerful arc arises between the electrodes, accompanied by a strong sound of a wide spectrum. Animals, especially dogs, do not like this sound very much; they run away with their tails between their legs.

In the United States, the population has 235 million units of firearms,
including 80 million pistols and revolvers. Thus, more than 2/3 of the population is armed.

State Department statistics

The stun gun will be indispensable for protection from dogs and other potential enemies, so its acquisition, despite the ban from the police, is highly recommended. How else to protect yourself on the street? Carry a knife, bat, sledgehammer? For whatever you take - everything is forbidden. Of course, there is a certain percentage of inadequate and psychopaths, but what about normal people in a dangerous situation - to run and shout "guard"? It was the concern for the safety of citizens that inspired me to write this article, and may the representatives of the law forgive me, but how else can a teenager protect himself on the street, against hooligans and gopniks? In general, in our turbulent time, you need to be on the lookout and have a simple, convenient and inconspicuous tool for self-defense. For example, a flashlight-shocker, which is first a flashlight, and then a shocker.

Chinese manufacturers took care of us and created a device that looks absolutely like a regular flashlight, but in front, on the reflector, there are completely invisible shocker electrodes. The set includes the flashlight itself, a cord for charging the built-in batteries of the device and a small case for fastening it to the belt.

The LED flashlight itself has a power of about 1 watt. It turns on with a black button.

Thanks to a powerful LED element and good optics, it shines beautifully. In everyday life, enough with the head.

If you press the red button of the device, discharges of about 15 kV (15 mm gap) will run between the electrodes with a deafening crack.

To prevent accidental pressing, there is a small toggle switch for blocking the inclusion at the end of the lamp housing. If you move the lever to the OFF position, turning on the stun gun will become impossible.

You don't have to worry about batteries - inside there are nickel-cadmium batteries for a total voltage of 6V and a transformerless charger - the simplest rectifier on a DB107 with a ballast capacitor of 680nF 250V (expect it to quickly deteriorate).

The charging current will be approximately 40 milliamps.

The red LED signals the battery charge when plugged into the socket.

Full charge time is about 12 hours. There are no indicators of the end of charging, so be guided by the time. With such a gentle charging current, you can leave it on charge for at least a week (if the 250 V capacitor withstands :)). The price of this shocker-flashlight in the online store is quite affordable.

Video uploaded by Helpful China
Search Helpful China 3 years ago

Replacing the high-voltage module in the flashlight, the shocker beeps.
Shocker module link https://ali.pub/q2glm or https://ali.pub/sa3ph
Link to the diode bridge https://ali.pub/9qfn3
Capacitor link https://ali.pub/qd5gb
Link to LEDs https://ali.pub/ncltw
Link to batteries https://ali.pub/tqmnz
https://ali.pub/mpkfo
There are no links to the flashlight-shocker, now you can not order it on Ali ((((

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