Working out the function of a combination of gates, Electrical Engineering

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Working out the function of a combination of gates?

Truth tables are able to be used to work out the function of a combination of gates.

Inputs			Outputs
A	B	C	D	E	Q
0	0	0	1	0	1
0	0	1	1	0	1
0	1	0	0	0	0
0	1	1	0	1	1
1	0	0	0	0	0
1	0	1	0	0	0
1	1	0	0	0	0
1	1	1	0	1	1

For illustration the truth table on the right show the intermediate outputs D and E as well as the final output Q for the system shown below.

2138_Working out the function of a combination of gates.png

D = NOT (A OR B)

E = B AND C

Q = D OR E = (NOT (A OR B)) OR (B AND C)

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