I am new to arduino and am building a coil-gun for my last quarters physics class. I am building a multistage coil-gun and have run into a problem. Check out this site to so that you'll know kinda what I'm taking about: http://www.youtube.com/watch?v=mdZo_keUoEs I am hooking up photo interrupters to an arduino and need to hook up a couple of capacitors to run the current through the coils while being able to have the arduino turn on and off the current running through the coils. My problem is that I'm using super capacitors (Maxwell 350Farads) and I need to hook them up so I could control there flow with the arduino without frying the arduino or anybody else. Any tips/suggestions would be much appreciated. I heard of ESC (Electronic Speed Control) but not sure if there strong enough.