Every now and then a DIY project surfaces on the Internet that’s so cool we have to share it, especially those we should probably recommend you not try at home. YouTube user Larsplatoon’s 1.25 kilojoule coilgun is exactly this kind of project. We’re not even sure where this battery-powered projectile slinger falls with respect to your state’s gun laws, but perhaps the best advice we can offer is what’s plastered to the side of the coilgun’s receiver: “Danger. High Voltage.
I've always thought it would be funny to build scale-size exploding grain silos for a model train layout. I've also had problems recently with pilot flames blowing out in some of our larger blow-something-flammable-through-something-on-fire projects. Both of these things made clear to me that I needed a good source of high-voltage sparks. So I built a buzz coil, a project derived from the ignition on a Model T that you can toss together to satisfy all your sparking needs with a just a few common automotive parts.
Just in time for the holidays, PopSci presents our roundup of the year's must-have products. From high-voltage flashlights and the flattest-screen TV to a waterproof camera and carbon-fiber laptop, it's the best and shiniest of 2007. Enjoy the offerings here.