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Solved 4. The relay circuit shown in the following figure is | Chegg.com
How to Use Transistor as a Switch with Example Circuits
Using an NPN Transistor as a Relay - YouTube
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Relays vs. Transistors: Which Is the Correct Choice? - Free Online PCB CAD Library
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Transistor Switching theory
Simple Transistor relay circuit | Transistor as a switch - YouTube
Model Making How To: Transistor Driven Relay Switch – KiwiMill
