How to Make a Coilgun.





Introduction: How to Make a Coilgun.

This tutorial will show you how to make a coil gun. I WILL NOT BE HELD RESPONSIBLE IF YOU HURT OR KILL YOURSELF! This coil gun does work but is VERY weak. It does shoot, but not very far ( 2-3 ft). I mainly made it to see if the charging circuit works.

1 disposable camera- you can get them from places that develop pictures. I used a FUJIFILMS camera.
enamel-coated magnet wire. I used 22-gauge wire.
1 momentary push-button from Radioshack
1 DPDT  Toggle switch from Radioshack
some tape - I used scotch tape.
AA battery holder ( the one that holds 2 batteries )
BIC pen

soldering iron
flat head screwdriver with a plastic handle
wire strippers

Step 1: Taking Apart the Camera.

1st- Take the wrapper off of the camera.
2nd- Remove the battery.
3rd-Open up the camera. This is where the screwdriver can come in handy. * ONCE OPEN DO NOT TOUCH THE CAPACITOR ( the thing that looks like a battery)*
4th- Touch  the metal end of the screwdriver to the 2 leads of the capacitor. If you don't know where to touch it look in the pics. This will create a large spark.
5th-Remove the circuit from the camera housing

Step 2: Working on the Circuit.

1st- Find where your battery was located and either desolder the leads or shorten the leads.
2nd-Solder 1 wire to each of the leads where your battery was located.
3rd-Solder the switch to one of the wires. Solder one wire to pin 3 and solder a new wire to pin 2.
4th- Solder the wire from pin 2  to the battery pack and make sure it goes to the right side of the battery-pack (+ to +and - to -)
5th- Solder the negative end of the battery-pack to the negative wire you soldered on the circuit.
6th-There will be a spot where you push a button or flip a switch. You will need to remove all metal on that part and solder a wire to the points so it will always be on.
7th-Solder 1 wire to each of the wires on the capacitor.
( see pictures for more detail)

Step 3: The Coil

Now is the hardest part to me...winding the coil.
Get the magnet wire and tape some of the wire down 30mm from the end of the pen and start wrapping the the wire as tight as you can for 30mm.  Stop at 30mm and start winding back on your coil but do not change direction, either clock-wise or counter-clockwise. I made 4-5 layers of coils just for testing. Solder 1 wire  to each wire on the coil.

Step 4: Connecting the Coil to the Circuit.

On one of the wires you soldered to the coil solder the momentary push-button.
Solder the wire from the capacitor to the push-button.
Solder the other wire on the capacitor to the coil and you're done!


Flip the toggle switch to the on position and you will hear a whining noise. This is normal. Once the light on the board is fully lit up, turn off the switch, push the push-button and it will shoot.

Step 5: My New Coilgun

I want to make a new coilgun with a capacitor bank and 26-gauge wire. I want to use photo-flash capacitors you find in disposable cameras 



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We have a be nice policy.
Please be positive and constructive.




A good suggestion would be to use several of those capacitors in parallel. The magnetic field strength is directly proportional to the current running through the coil, and capacitors in parallel produce greater current. Also, use a thyristor or any high power mosfet switch to activate the coil as not to ruin any components.

Will a coil like this.. Made from insulated wire.. Work in place of magnetic wire? Do i need to coil more wire?

And, to increase electromagnets' strength, can a piece of aluminum foil be wrapped below the coil on the pen tube??


I'm using 320V, 165uF capacitors, I got 14 on ebay for ~$5. Had to wait a month or so since they were from china though.

How many voltage or current do i need to shoot abt 30 feet from about 3-4 feet high

Guys help me to make powerful coil gun if anyone have idea plzZ tell me

Can you use this to make a multi-stage coilgun?


I like to make One of these

Can you send me the detailed information of this construction?&send pieces of information values?


I like to make One of these

Can you send me the detailed information of this construction?&send pieces of information values?


I like to make One of these

Can you send me the detailed information of this construction?&send pieces of information values?


I like to make One of these

Can you send me the detailed information of this construction?&send pieces of information values?

I also plan to make a coilgun like this but mine will be 800v and portable.Oh and is a 800v coilgun powerful enough?

1 reply

Because the strength of a magnetic field is determined by the current not the voltage, I would recommend putting multiple capacitors in parallel.

I really like your coilgun! Maybe you consider to make it more powerful. I have also made a coilgun for a science project and I have done a lot of measurings. The best is to make 1000 windings (100windings each layer, about 10 layers.. That's a lot i know :P) and you'll also need 5 flash capacitors. If you are interested, you can always check my coilgun:

try RimstarOrg's winding technique

Anyone know how to wire ten of these fuji chargers in parallel? How many volts from the batteries could it handle before it fried?

Why not use a power source other than batteries while in the R&D portion of the project to charge the cap/s? This could save a lot of dough on expensive batteries.....


1 reply

i use cheap AA's get them off ebay. $10 for a big bag full

hi i want make a coilgun but its must be more powerful than this.and must be simple.if u can help me what i use and how much use for example 680 UF 400 V like this. thank u.

1 reply

You should be able to remove the capacitor from the board and put the ones you have in there. Check some other instructables on here and they my be able to help you more. Take some pics and post them here please.