Making logic gates from transistors

Digital Logic Gates from Transistors, AND, NAND, OR, NOR, XOR, XNOR, Buffer, and Inverter

How to make NOT gate using transistor

Circuit Assembly Tutorials || How to Build a NOT gate with an NPN Transistor

How to make a NOT gate using BJT or Bipolar Junction Transistor

OR Gate using Transistors on a Breadboard

OR gate Explained: Basics, Working, Truth Table, Properties, and Examples