How to Make a DIY Taser Gun

A Taser also known as Stun Gun is one non-lethal electric shock producing unit used to paralyze a person for a time being without causing any severe damage or injury. It is a very useful device, especially to immobilize an attacker.

Using and making of stun gun is restricted in most of the countries.

However, in the United States of America, some state allows use of stun gun.

A stun gun is available in variety of styles like lipstick stun guns, cellphone stun guns, stun batons, police force stun guns, pink ribbon stun guns and disguised stun guns.

How it works?


A Taser functions like two-stage voltage converter. In the first stage, the high frequency switching transformer increases the battery voltage to several kV to charge the capacitor. After the capacitor is charged, it powers the second transformer by increasing the voltage to 10 – 50kV (approx.) with the repetition rate of 5-40 Hz (approx.).

Taser Types


There are basic types of Taser: Multiplier, Thyristor and spark gap. Multiplier Taser is made of one transformer having voltage of higher output and it runs on DC voltage.

This type of Taser also has high-voltage capacitors and diodes and it is for the capacitors that multiplier Taser makes loud sound.

The Thyristor type is the most efficient one. Here the voltage of the capacitor is not high (250 – 500 V approx.) and it functions with the aid two main components: resistive divider (neon lamp) and diac.

The spark gap guns on the other hand is the most cheapest and ineffective stun gun. As the name implies, it has spark gap to function and the voltage of the battery is charged with transistor converter.

How I made my Taser


Of the three types of Tasers, I chose to go ahead with the Thyristor because of its effectiveness. I used MOSFET (Metal–Oxide–Semiconductor Field-Effect Transistor) to build the voltage converter. The main reason to use MOSFET is purely from the point of efficiency.

In a push-pull converter which is generally used in stun guns, the level reaches around 20% whereas in MOSFET the converter gives efficiency as much as 75% with the working frequency of 80-120 kHz.

I then used a gate thyristor for the second switch along with four neon glow lamps with the ignition voltage of 95V and the pulse repetition rate of 30 – 50 Hz.

Transformer Specifications


For inverter transformer, I preferred to use EE core based transformer keeping the middle column cross-section of 20 – 25 mm2.

The air gap of 0.5mm thickness is place in the mid column. The primary polarity is set to 2x12 turns of the diameter of the wire (0.4mm) while the secondary polarity is set to 700 turns of wire (0.1mm).

The secondary polarity is wounded in multiple isolated layers. The reason to isolate the layers is to avoid breaking the wire enamel under high voltage. There are two electrodes in a Taser gun. They look like a dart and are connected to the main unit with a conductive wire.

Battery Specifications


One can power a stun gun with either six 1.5 V cells or seven 1.2 V cells.

The best option is to have two cells or Li-pol or Li-ion connecting the series. It should be noted that this stun gun may draw current upto 1.5 amps when switched ON, which means ordinary batteries might not work efficiently, and drain out quickly.

Written and Submitted By: Dhrubajyoti Biswas  

Circuit Diagram


Need Help? Please send your queries through Comments for quick replies!




Comments

ronald said…
Hi Mr.Swagatam.
How many volt is the output and how is the Transformer T2?, can I use TV FBT/flyback transformer?,maybe by seperated between primary n secondary?,or new own primary winding?,how many turn?,thanks in advanced.
Swagatam said…
Hi ronald, yes you can use a TV flyback transformer for TR2...i am not sure about the winding details, may be you can try the existing primary of the FBT and check the response.

the output will depend o the FBT specs.
Swagatam said…
thanks for updating the info, appreciate it very much!
Sahana Shettar said…
What is output current and voltage rating of this circuit..plzzzz reply???
Swagatam said…
the voltage should be from 6V to 12V, and the current around 2 amps
sir how to make cartridge of taser gun,because i am doing it as a project work please help e out to get that sir or mail me at darshanmd.dr@gmail.com
Swagatam said…
darshan, you can easily find the details with an online search....
Ben said…
Don't you sell this as a components Kit? theres a million different schematics out there, most are either dangerous or don't work, and when I finally find a decent schematic, either the components aren't labelled properly, or they are really hard to find in component stores. I understand the science behind the circuit, and the risks of making it, I just want a reliable source of components for this project, in the form of a Kit. The internet can be hard work sometimes
Swag said…
sorry, I don't sell components because selling and maintaining an online store can be a lot of work. But you can get the parts from any reputed online store.

all the resistors are 1/4 watt 1% MFR
220uF capacitor is electrolytic, remaining are metallized PPC
David said…
Can I replace a BA159 diode with a BA157 diode
Swag said…
BA157 is rated at 400V therefore it won't work
Poppy Ann said…
Hi there,

You stated "It should be noted that the stun gun draws current of around 1.5 V" when current is measured in amps not in volts.
Swag said…
Thank you for notifying, I have corrected the description.
Sketchy said…
I'm trying to build the inverter transformer. Found a set of ferrite E cores with a 1mm air gap in the middle column. Cross sectional area is 25mm2. Should it work OK for the inverter transformer? And how many isolation layers do I need in the secondary windings? Can 38 AWG polyurethane insulated magnet wire withstand 500 volts?
Swag said…
Ferrite cored transformers are complex devices and cannot be estimated without calculations, you can try referring to the following articles and see if they help you to optimize as per the specs.

https://makingcircuits.com/blog/how-to-calculate-ferrite-transformer-for-smps/

https://www.homemade-circuits.com/how-to-design-a-flyback-converter-comprehensive-tutorial/
Sketchy said…
Will turning on the transister somehow cause the MOSFET to turn off? Is that how it forces the power going into the primary windings to change direction? Please help this is my first project since high school electronics.
Swag said…
The BJT is only for controlling current, it is not involved with the generation of the oscillations or the frequency. If the current tends to rise, an equivalent amount of voltage will develop across the 0.56 ohm resistor which will force the BJT to conduct and ground the mosfet gate, inhibiting its conducion...
Sketchy said…
Thanks. The "0.56 ohm resistor" in my curcuit is 4 watt 0.07 ohm which according to multimeter, has less resistance than the wire connected to the transister base. Correct me if I'm mistaken, In my case no voltage develops across the resistor, and the transistor never turns on. Would that cause problems such as MOSFET getting hot?
Swag said…
A 0.07 ohms would require 8 to 9 amps to activate the shown BJT, which may be too high. If your mosfet current is rated above the power supply current in that case this BJT and the resistor stage can be entirely eliminated. The mosfet could be mounted on a heatsink for avoiding over heating
Sketchy said…
If the BJT is removed, what's controlling the MOSFET? I'm assuming the MOSFET is supposed to switch on/off many times a second.
Swag said…
the coil, the resistors and the capacitors together with the mosfet are responsible for creating the oscillations.

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