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LVL1 community member Tim G. and his wife created this great ghostbusters costume for their son Harper.

I have attached the schematic for the proton pack lights.  I used a 6V lantern battery as part of the pack so I didn't need a voltage regulator.  The flashlight has a separate 9V battery located in the gun and 6 white LEDs.

I used these plans for the pack: although many parts had to be swapped out for similar items that were half the size.
The main structure of the pack is made from black coroplast since I had some on hand.  In fact I made the whole pack aside from the straps using items I had lying around.  For sounds I mounted a small mp3 player on the gun and used the 6V battery to power a set of USB powered PC speakers.