Essay Available:

You are here: Home → Lab Report → Technology

Pages:

4 pages/≈1100 words

Sources:

Level:

MLA

Subject:

Technology

Type:

Lab Report

Language:

English (U.S.)

Document:

MS Word

Date:

Total cost:

$ 21.6

Topic:

# Lab Report on Logic Circuits (Lab Report Sample)

Instructions:

answer all the questions from my lab introduction. I will give you the data (that you should write on my report) tonight. Please follow the step of the template that I have given to you

source..Content:

Studentâ€™s Name

Teacherâ€™s Name

Course Title

Date

Lab Report

Abstract

This laboratory report was done mainly for the study of the logic gates. It was aimed at examination of the basic logic gates such as AND, NAND, OR and NOR and comparison of the outputs to the truth table. The experiment was also aimed at study of the behavior of the gates such as 74xx series TTL gates by using voltage range of 0 and +5. This lab was finally based on laying out the simple test circuit on the on the prototype board and identification and testing of the output level of the gates using LEDs.

Introduction

Logic gates always have one output and two or more inputs. They bond with the digital basic levels on the input which make them provide digital basic level output. This depends entirely on the applied input to the gate and the logic gate type used. In this experiment, AND, OR and NOT gates are used to determine the combination of binary inputs and there corresponding output. Other complicated logic gates such as NOR, X-NOR, and NAND gates are constructed from the basic logic gates. Input and output combinations are shown in a truth table. Combination of more than one gate is possible hence this can give a desirable output.

Some of the equipment that were used during the experiment are;

* DC power supply with variable voltage

* 2 DVMâ€™s

* Chip extraction tool

* Prototype board (with 5 V supply) jumper kit

* LED + 470 â„¦ current- limiting resistor and digital chips (AND-7408, OR-7432, NOT-404, NAND-7400, NOR-7402).

Procedure

The output voltage of an AND gate was measured when one of the inputs was zero and the other was a zero or a one. One of the AND inputs was grounded or set to "0" and variable voltage applied in the range of 0V â€“ 5V to the next input. LED and a 470 â„¦ resistor were used on the AND output to test if "0" or "1" states exist and this followed with determination of minimum and maximum input voltage that was required to turn the output from a "0" a "1â€. The purpose of the resistor is to limit the amount of current through the LED to avoid burning the light emitting diode (LED). The lights when the output is 1 (logic 1) and does not light when output is 0 (logic 0)

AND gate

0K (output)

1

After the above procedures, determination of which pins on one the SPDT switch was connected for each of the switch states that were connected then one switch on each input was used to switch between +5V. Identification of the truth tables of the standard gates followed whereby the five chips in the basic TTL series were obtained and the measurement of truth tables in the IC chips there were present. Construction of XOR using and XNOR gates using AND, OR and NOT gates only was done and determination of the truth tables at the output and at many intermediate points in the constructed circuit. Finally XOR gate was constructed using the NAND gates only. The following are mathematical formulas for determining output from a given set of inputs in logic gates.

Logic Gate

Formula for output (X), (where A, B, or C are binary inputs-0 or 1)

AND

X = A. B. C (multiplication) read as A AND B AND C

OR

X = A + B + C (addition) read as A OR B OR C

NOT

X = A-1(Inversion)

NAND

X equals NOT (A AND B AND C)

XOR

X equals NOT (A OR B)

XNOR

It complements XOR

Truth table for OR gate

A

B

X

0

0

0

0

1

1

1

0

1

1

1

1

Truth table for AND gate

A

B

X

0

0

0

0

1

0

1

0

0

1

1

1

Truth table for NOT gateTruth table for NAND gate<...

Teacherâ€™s Name

Course Title

Date

Lab Report

Abstract

This laboratory report was done mainly for the study of the logic gates. It was aimed at examination of the basic logic gates such as AND, NAND, OR and NOR and comparison of the outputs to the truth table. The experiment was also aimed at study of the behavior of the gates such as 74xx series TTL gates by using voltage range of 0 and +5. This lab was finally based on laying out the simple test circuit on the on the prototype board and identification and testing of the output level of the gates using LEDs.

Introduction

Logic gates always have one output and two or more inputs. They bond with the digital basic levels on the input which make them provide digital basic level output. This depends entirely on the applied input to the gate and the logic gate type used. In this experiment, AND, OR and NOT gates are used to determine the combination of binary inputs and there corresponding output. Other complicated logic gates such as NOR, X-NOR, and NAND gates are constructed from the basic logic gates. Input and output combinations are shown in a truth table. Combination of more than one gate is possible hence this can give a desirable output.

Some of the equipment that were used during the experiment are;

* DC power supply with variable voltage

* 2 DVMâ€™s

* Chip extraction tool

* Prototype board (with 5 V supply) jumper kit

* LED + 470 â„¦ current- limiting resistor and digital chips (AND-7408, OR-7432, NOT-404, NAND-7400, NOR-7402).

Procedure

The output voltage of an AND gate was measured when one of the inputs was zero and the other was a zero or a one. One of the AND inputs was grounded or set to "0" and variable voltage applied in the range of 0V â€“ 5V to the next input. LED and a 470 â„¦ resistor were used on the AND output to test if "0" or "1" states exist and this followed with determination of minimum and maximum input voltage that was required to turn the output from a "0" a "1â€. The purpose of the resistor is to limit the amount of current through the LED to avoid burning the light emitting diode (LED). The lights when the output is 1 (logic 1) and does not light when output is 0 (logic 0)

AND gate

0K (output)

1

After the above procedures, determination of which pins on one the SPDT switch was connected for each of the switch states that were connected then one switch on each input was used to switch between +5V. Identification of the truth tables of the standard gates followed whereby the five chips in the basic TTL series were obtained and the measurement of truth tables in the IC chips there were present. Construction of XOR using and XNOR gates using AND, OR and NOT gates only was done and determination of the truth tables at the output and at many intermediate points in the constructed circuit. Finally XOR gate was constructed using the NAND gates only. The following are mathematical formulas for determining output from a given set of inputs in logic gates.

Logic Gate

Formula for output (X), (where A, B, or C are binary inputs-0 or 1)

AND

X = A. B. C (multiplication) read as A AND B AND C

OR

X = A + B + C (addition) read as A OR B OR C

NOT

X = A-1(Inversion)

NAND

X equals NOT (A AND B AND C)

XOR

X equals NOT (A OR B)

XNOR

It complements XOR

Truth table for OR gate

A

B

X

0

0

0

0

1

1

1

0

1

1

1

1

Truth table for AND gate

A

B

X

0

0

0

0

1

0

1

0

0

1

1

1

Truth table for NOT gateTruth table for NAND gate<...

Get the Whole Paper!

Not exactly what you need?

Do you need a custom essay? Order right now:

### Other Topics:

- Lab Report on Logic CircuitsDescription: Answer all the questions from my lab introduction. I will give you the data (that you should write on my report) tonight...4 pages/≈1100 words| MLA | Technology | Lab Report |