Transistors as a Switch: Theory & Explanation

How to Use an NPN Transistor to Switch on an LED - Electronics for Absolute Beginners

BJT Transistors - Electronics Switches and Inverters

Using a Transistor as a Switch

How To Use Transistors In YOUR Projects! || Transistors Explained || Transistors As A Switch

How to use a transistor as a switch

Transistor Logic Gates - NAND, AND, OR, NOR

Making logic gates from transistors

Logic Gates from Transistors: Transistors and Boolean Logic