Thursday 6 November 2014

Logic gates

http://www.bbc.co.uk/schools/gcsebitesize/design/electronics/logicrev2.shtml



Logic gates

Truth table for an OR gate

The relationship between the inputs and the output can be captured in a truth table. A and B represent the inputs and Q is the output.
ABQ 
0 0 0
0 1 1
1 0 1
1 1 1
 


               
 
Circuit symbol of OR gate

ABQ
0 0 0
0 1 0       Truth table for an AND gate
1 0 1
1 1 1   


Circuit symbol of AND gate

AQ
0 1    
   Truth table for a NOT gate
1 0    


Circuit symbol of NOT gate


 

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