The NOT (Symbol) circuit performs the operation called inversion also called inverter. The inverter change one (HIGH or LOW) logic level to the opposite level. It has single input and single output. Logic gates are primarily implemented using Diodes or Transistors acting as electronic switches, but can also be constructed using electromagnetic relays (solid state relay logic)
When input A=LOW then output is HIGH.
Input A=HIGH then the output is LOW.
LOGIC EXPRESSION:- IC= 7404 The input variable is expressed as A and output variable as Y. The NOT gate is used to get the ones complement of the given binary number.