Electronic business card demonstrates transistor amplification

Craft & Design Technology

Aaron Alai designed this kicking electronic business card, which demonstrates how transistor amplifiers work. When you touch two electrodes on it, a small amount of current is conducted through your body, which is then amplified by a transistor to light an LED. I like the clean design, which is both functional and descriptive of how it works. [via Hacked Gadgets]


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