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Mark Frauenfelder teaches a crowd at Engadget Expand how to build a basic circuit. Using a 555 timer, breadboard, and some common components, participants used conductive paint to design a touch-circuit on paper.

We’ve captured his presentation and you can follow along at home:

[youtube=http://youtu.be/SNk_nbi1MqA&w=620&h=349]

Originally published Nov. 10, 2013.