[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...
https://www.neatorama.com/2012/06/10/circuit-board-business-card-2/
Circuit Board Business Card...
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