Elenco Understanding Logic Gates and Circuits Manual do Utilizador descarregar pdf (Página 10)

U17

Project 3: OR Gate

This circuit demonstrates how the OR Gate

(U17) 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 either input A OR input B are high

(1), then the Q output will be high (1), and

the red LED (D1) will be on.

OR gates are used in digital logic circuits to perform a logical add. When one of the inputs is high (1), the

output is high. The output will only be low (0) when both inputs are low.

Input (A) Input (B) Output (Q)

0 0 0

0 1 1

1 0 1

1 1 1

The output of an OR gate is often

represented as the sum of the inputs, so

Q = A+B.

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Elenco Understanding Logic Gates and Circuits Manual do Utilizador Página 10