4.04 – Logic Diagrams


Previous: 4.03 - Complex Truth Tables

Logic diagrams are often drawn to represent boolean expressions.

Each logic gate has its own symbol.


Diagram 1 shows the symbol for a NOT gate.

Diagram 1


Diagram 2 shows the symbol for an AND gate.

Diagram 2


Diagram 3 shows the symbol for an OR gate.

Diagram 3


Diagram 4 shows the symbol for an XOR gate.

Diagram 4


There symbols can be combined to represent boolean expressions.



Draw the logic diagram for the expression Q = NOT(A XOR B).

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Next: 4.05 - Logic Symbols



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