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Transistor as a Switch - Using Transistor Switching
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How to calculate Resistor needed in PNP Transistor Circuit - Electrical Engineering Stack Exchange
Control System Basics - NPN vs. PNP Logic - Sealevel
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PNP Transistor - The Amazing World of Electronics
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PNP Transistor - How Does It Work? - Build Electronic Circuits
Driving one LED from audio signal only with pnp transistor - Electrical Engineering Stack Exchange
