If you need to open a lock, or simply put up a lot of cabinets, the sonic screwdriver is the tool for you. If you don't know about Doctor Who, the most amazing sci-fi/everything series ever, go see it right now. This was my first attempt at making a sonic for myself, modeled after the 9th/10th Doctor design. I'm quite pleased with the results; it lights up, and beeps a solid tone. Producing that famous sound would require a microcontroller or the like, which just won't fit inside the body. So, here goes... p.s. If you like this instructable, vote for it in the Celestron Space Challenge!