Elenco Understanding Logic Gates and Circuits - Manual (Page 9)

U
1
6
Project 2: AND Gate
This circuit demonstrates how the AND
Gate (U16) works. Turn the slide switch
(S1) on. Connect the loose ends of the red
and black wires to either low voltage
(denoted as a “0”) or high voltage
(denoted as a “1”). If, and only if, both
input A
AND input B are high (both 1s),
then the Q output will be high (1), and the
red LED (D1) will be on.
AND gates are used in digital logic circuits to perform a logical multiply. When one of the inputs is low (0),
the output is low (i.e. multiply by 0). The output will only be high (1) when both inputs are high.
A
Q
B
Input (A) Input (B) Output (Q)
0 0 0
0 1 0
1 0 0
1 1 1
1
1
1
1 1
2
2
2
2
2
3
3
2
The output of an AND gate is often
represented as the product of the
inputs, so Q = AB .
9
1
0
2
2
1
3
2
A
B
Q