Click here for more detailed pictures and videos of the build!
This coilgun model movie prop was built inside a fully functional airsoft G36, which cost about 40€ on Amazon.
These are the parts I used for the coilgun movie prop:
I took apart an old flash and removed both transformer and capacitor.
I bought this 4x20 Scope to be mounted on the Coilgun.
Additional capacitors for more capacity.
These are stainless steel barrels which
hold the lasers.
The voltage meter will indictate the capacitor's voltage.
Some led-wire was used to spice up the rifle's looks.
Leds combined with a water balance give this little gadget a nuclear battery look.
Why use one led when you can have three?I bought them here.
This is a 11mm and 22mm adapter for scopes and other visual aiming devices.
The Thyristor is the most important part.
It is the switch, which connects the charged capacitor to the coil. I used a S6025L C1 Thyristor. The basic schematic and knowledge about a coilgun can be found here.
This is the night vision camera. It has four infrared Leds for clear sight when it's dark.
The viewfinder was salvaged from an old analog camcorder.
More information here.
This is the 1 gram
steel projectile. It is just
a piece of a stainless steel rod.
This is the transformer. It charges the capacitor up to 350 Volts. The capacitor has a capicity of 1000 uF. You can also see an indicator lamp on the right. It is filled with gas and starts glowing when the capacitor's voltage reaches about 300 Volts.
The next step was to take apart the airsoft toy and create some space inside for all the electronics. I removed the airsoft gearbox and saved it for the automated sentry gun and the remote controlled airsoft turret. This is a standard gearbox available in most countries from ages 14 and up. It has a kinetic energy of less than 0,5 Joules.
I wound the coil with enamelled copper wire:
As you can see, this is 0,5 mm in diameter enamelled copper wire. I used 46 metres for the coil. The coil itself is about 24 mm long.
I removed the airsoft gearbox and made some space for the transformer, voltage meter and coil inside the movie prop:
I bought the 500V led backlight voltage meter on ebay for about 11 €. The main trigger circuit looks just like this:
Of course, the trigger switch was hooked up to the airsoft toy's trigger. The secondary circuit is pretty straight forward: The voltage meter's measuring inputs are directly connected to the capacitor, the night vision camera's signal output is connected to the viewfinder's input and all the leds are connected to the batteries.
After many hours of wiring and soldering everything was ready to be powered up by the two 9 Volt batteries inside the magazin:
There are four springs mounted on top of the magazine. Sliding in the magazin connects the batteries to the leds, night vision camera and viewfinder, transformer and the trigger ciruit. If you want to know more about the night vision camera, here's a whole article about it.
Here's a video demonstration showing the model's different features like the night vision, powering up through sliding in the magazine, laser sight and capacitor charging: