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LED Flashers Circuits and Projects using transistor | ElecCircuit.com
NPN LED Driver - Why an extra resistor to ground at the Base? | Electronics Forum (Circuits, Projects and Microcontrollers)
Simple LED and Transistor Switch - Silverlight Developer
Electrical Engineering - Driving LED with NPN transistor from I/O pin
arduino - Using NPN transistors as on/off switches for a LED circuit - Electrical Engineering Stack Exchange
Transistor Basics
