DISCLAIMER: This instructable is intended for informational purposes only. The taser should not be tested or used on any living creatures, human or otherwise. Doing so will result in pain, and could be damaging to the individual, and could result in death, particularly in individuals who have heart issues or who are young or elderly. The construction of the circuit(s) detailed in this instructable should only be executed by individuals who are experienced in the field of electronics, and who have taken the proper safety precautions in the construction of the circuit(s). This instructable deals with the construction of a device that generates high AC voltage, and is therefore potentially dangerous. Do not attempt to build this instructable if you are not experienced with electronics, electricity, alternating current, and high voltages. Do not attempt to build this instructable if you have malicious intentions.
I, as the author of this instructable, am not responsible for any damage, death, harm (physical, emotional, mental, or otherwise), monetary loss, destruction, loss of data, damage of relationships, or any other unintended or unwanted effects resulting from the construction or use of this instructable.
If you choose to continue to view or construct this instructable, you are agreeing to the above terms and conditions, and release the author of this instructable from all liability directly or indirectly relating to this instructable.
Step 1: Parts and Explanation
This instructable will teach you how to make an extremely simple, but very effective taser. The thing that is great about this design is that you can use different parts in order to customize it to fit your needs. For example, if you value a higher voltage output over ease of portability, you can use a larger transformer, or a larger powersupply.
Now, to begin, you will need the following electrical components:
-Small transformer (x1)
-Small DC motor (x1)
-9V battery (at least x1)
-9V battery connector (at least x1)
As for the transformer, it should be a mains transformer. In other words, it should have only four leads; 2 for the primary coil, and 2 for the secondary cool. There does not need to be a center tap. You can salvage an effective transformer from an AC adapter, such as a phone charger. If you do this, you will need to first remove the plastic casing of the adapter (easier said than done; this often requires brute force and a fair amount of time), and then remove the transformer from the rectifier circuit and any additional circuitry.
I generally go for transformers that have 120V to 300V on one side, and anywhere from 3V to 7V on the other side.
Note that in this instructable, we will always be treating the lower voltage side as the primary coil.
As for the small DC motor, there isn't too much to say about it. You can experiment with various shapes, sizes, voltages, etc. However, one requirement is that you CANNOT use a brushless motor. The purpose of the motor is to create an AC ripple in the DC voltage supplied by the battery. This could be done via an oscillator or transistor circuit, but I haven't used such a circuit in building a taser before, mainly because I haven't had access to an appropriate transformer for quite some time. In order for the motor to be effective, it should be a pretty low voltage motor, but make sure you aren't maxing out the motor. I would suggest maybe a 3V or 5V motor. Don't use a 9V motor, because then you won't have enough excess voltage for the coil.
As for the wire, I would suggest rubber insulation, and use a reasonable gauge, around 20 gauge solid copper wire.
The switch needs to only connect two leads. You can use a button switch or toggle switch. It's up to you.
You can build this taser a number of ways. If you are using 9V batteries, you can do it three ways that seem to yield good results. The first way is to simply use a single 9V battery. The second way is to connect two 9V batteries together in series to increase the primary voltage to 18V. The third method is to connect two 9V batteries together in parallel to increase the capacity of the powersupply. The advantage of doing this is that you can use the taser for longer before the batteries are exhausted.
Step 2: Building the Circuit
Connect the positive (+) lead on the 9V battery connector to the positive (+) terminal on the DC motor.
Then connect the negative (-) lead of the 9V battery connector to one end of the switch you are using.
Next connect the other end of the switch to one end of the transformer, on the LOW VOLTAGE SIDE.
Now connect the negative (-) terminal of the motor to the other lead of the transformer on the LOW VOLTAGE side.
Step 3: Connecting the Battery & Testing
Connect the battery (or batteries) to the battery connector(s), and use a MULTIMETER on an AC setting to test the output voltage of the transformer. Start with a higher voltage AC setting, and switch to a lower voltage AC setting if necessary in order to get an appropriate reading.
Be careful not to overload your multimeter, MAKE SURE THAT THE MULTIMETER IS IN THE AC FUNCTION.