#145 - Lighting an LED With Your Finger (Using a 2N3904 Transistor!)
0:47
YouTubeThe Tech Circuit
#145 - Lighting an LED With Your Finger (Using a 2N3904 Transistor!)
Can the current through your own body light an LED? Yes—with the help of a transistor. In this video, I demonstrate how a 2N3904 transistor can amplify the tiny current through your finger enough to light an LED. One transistor isn’t quite enough—but when we connect two 2N3904s as a Darlington pair, the current gain jumps to around 20,000 ...
4.3K views2 weeks ago
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