Circuit Board Business Card...

[YouTube clip]...  ...rcuitry at all? Finally I got the idea of using a 555 timer (after seeing something about worldwi...  ...fter seeing something about worldwide 555 timer competitions on the EEVBlog) that wou...  ...g on some external interaction to the *strong...

http://www.neatorama.com/2012/06/10/circuit-board-business-card-2/