Don Bosco Technical College City of Mandaluyong Logic Circuits and Switching Theory

Basic Logic Gates and Breadboard Familiarization

I. Objectives:

For the students to be familiarized with the behaviour of OR, AND, NAND and NOT gates.

For them to learn how to construct a basic logic circuit.

For them to be familiarized with the use of the Breadboard in constructing and testing logic gates and circuits.

II. Equipments:

Equipment Qty

Breadboard 1

DMM 1

LM7805 – Voltage Regulator 1

9V battery with connector 1

74LS04 1

74LS08 1

74LS32 1

74LS00 1

LED 1

330 Ω 1

Solid Wires 1

Wire Cutter 1

III. Experiment

1.) 5V Power Supply

This part of the experiment aims for the student to learn how to make a simple 5V power supply in order to generate the necessary voltage for logic gates. Using the 9V battery, LM7805 and some solid wires, construct the circuit as shown in Fig 1.1. Measure the output to determine the value of Vo.

78051

2

3+

-

Vo9V

Fig 1.1: 5V Power Supply Circuit

= ________

Don Bosco Technical College City of Mandaluyong Logic Circuits and Switching Theory

Basic Logic Gates and Breadboard Familiarization

2.) Basic Logic Circuit Construction

Procedure:

1.) Determine the outputs of the Circuits. 2.) Construct the Circuit on the breadboard and determine all the outputs. Compare the Actual

from the Theoretical.

A

B

C

Z

Z = _____________________

Truth Table

A B C Z Actual

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

1.) Given the same procedure perform the equivalent truth table for the circuit below.

Truth Table

A B C D E F Z Actual

0 0 0 0 1 1

0 0 1 1 0 1

0 1 0 0 0 1

0 1 1 1 1 0

1 0 0 0 1 0

1 0 1 1 1 0

1 1 0 1 0 1

1 1 1 1 0 0

Don Bosco Technical College City of Mandaluyong Logic Circuits and Switching Theory

Basic Logic Gates and Breadboard Familiarization

Prelab Assignment: 1.) Determine the description combinational logic circuits and how it is constructed. Provide a sample combinational logic circuit which applies all knowledge gained from the previous theories discussed regarding logic circuits. 2.) Provide the necessary simplified data sheets for every logic gate needed for the laboratory.