A long time ago(like 10 years ago) I came across a link(I believe from Totse) that led me to some nice schematics for building a device that could change traffic lights. I am getting into AVR programming and would like to read about these types of things. I've came across other schematics that I find interesting, that don't fit in with the basic hobbiest stuff.
This seemed kind of cool because a person could set it up to try a shit load of cards and wire it up under their clothing and have this part stick out of their sleeve. Although I am not sure what it could actually do if the person didn't have legit card data, but I'm sure it could be rigged up to place into an ATM and attempt something...
http://hackaday.com/2008/08/04/magnetic-stripe-card-spoofer/If anyone has any links or forums it would be great.
