How to Use Transistor as Relay | NPN Transistor as DC Switch | Best Relay Alternate for Arduino - YouTube
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Switching 12V with an NPN transistor only outputs 5V on the emitter when the base is at 5V - Electrical Engineering Stack Exchange
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power supply - How to control 12V from 5V using transistor? - Electrical Engineering Stack Exchange
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How to Use Transistor as a Switch with Example Circuits
The Answer is 42!!: How do you use PNP transistors
Using Transistors As Switches
Control a 12v from 5v. - General Electronics - Arduino Forum
switches - Can i switch npn transistor using 12v - Electrical Engineering Stack Exchange
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What NPN transistor should I use if I'm planning to use a 4V current to switch on a 12V solenoid lock? - Quora
