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Hack your usb missile launcher into an "Auto-aiming autoturret!"
Make an Ultra Simple High Voltage Generator
Easy Lego iPod Speaker for less than 2 $ !
Hack The Spy Ear and Learn to Reverse Engineer a Circuit
Humanoid robot arm
MintyBoost! - Small battery-powered USB charger
Simple Animatronics (robotic hand)
Autonomous, Wirelessly Controlled Hovercraft
How to build your own Jet Engine