Add a key-fob opener to your door

posted Oct 14th 2009 11:30am by Mike Szczys
filed under: classic hacks, home hacks

key-fob-door-opener

It seems like creating an automatic dorm room door opener is a rite-of-geek-passage each fall. [Adam], a student at Vassar, passed with flying colors by creating this clean setup. We’ve got video, more pictures, and a description after the break. Read the rest of this entry »

Tesla coil tuner

posted Jun 24th 2008 9:40am by Will O'Brien
filed under: classic hacks, misc hacks


Here’s one more use for the insanely handy LM555 chips. [Terry] put together a Tesla coil tuner around one. The 555 is used to generate a range of frequencies while a simple double LED arrangement indicates the presence of an output spike from a coil due to the resonance.

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