Control System Basics - NPN vs. PNP Logic - Sealevel
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Testing Transistor NPN with LED circuit at home - YouTube
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Transistors - SparkFun Learn
Transistors - SparkFun Learn
NPN Transistor Help - Lighting a 5V LED Strip - Project Guidance - Arduino Forum
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Transistor Circuit to Drive LED
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Simple LED Flasher Circuits Using 2N3904 NPN Transistor
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led - Why is my transistor accepting power from a base? - Electrical Engineering Stack Exchange
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Transistors - SparkFun Learn
Driving an LED using a Transistor
