SECOND SIMPLEST CIRCUIT
SECOND SIMPLEST CIRCUIT
This the second simplest circuit in the world. A second transistor has been added in place of your fingers. This transistor has a gain of about 200 and when you touch the points shown on the diagram, the LED will illuminate with the slightest touch. The transistor has amplified the current (through your fingers) about 200 times
source : http://www.talkingelectronics.com.au/projects/200TrCcts/200TrCcts.html
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