6 - NPN Transistor Circuit

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02:28:16

The charge held in the capacitor is used to power the transistor. The transistor provides the path for the current to the LED. Because the base of the transistor uses much less power than the LED, the voltage drains from the capacitor very slowly. The higher value resistor of 22,000 ohms slows the drain from the capacitor significantly. The LED stays on much longer. 

published 8 years ago

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