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Transistor Basics
How to Use an NPN Transistor to Switch on an LED - Electronics for Absolute Beginners - YouTube
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NPN or PNP transistor for common-cathode seven segment display LEDs? - Electrical Engineering Stack Exchange
Control System Basics - NPN vs. PNP Logic - Sealevel
Working of Transistor as a Switch - NPN and PNP Transistors
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Transistor as a Switch - Using Transistor Switching
led - How does this PNP transistor circuit work? - Electrical Engineering Stack Exchange
PNP Transistor - How Does It Work?
