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How to Use Transistor as Relay | NPN Transistor as DC Switch | Best Relay Alternate for Arduino - YouTube
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voltage - Elimination of transistor in 12V Switching Circuit - Electrical Engineering Stack Exchange
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Analysis of MOSFET as a Switch with Circuit Diagram, Example
What NPN transistor should I use if I'm planning to use a 4V current to switch on a 12V solenoid lock? - Quora
Using Transistors As Switches
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Transistors as a switch - HomoFaciens
Transistors - SparkFun Learn
The Answer is 42!!: How do you use PNP transistors
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How to Use Transistor as a Switch with Example Circuits
