+234 813 0686 500
+234 809 3423 853
info@grossarchive.com

DESIGN AND CONSTRUCTION OF 20WATTS WIRELESS PUBLIC ADDRESS SYSTEM

  • Type:Project
  • Pages:44
  • Format:Microsoft Word
(Electrical Engineering Project Topics & Materials)
ABSTRACT
It has become inevitable that there would be communication and due to the inherent limitation of the human voice, the public address system came to being. A public address or “P.A SYSTEM” is an electronic amplification system with a mixer ,amplifier and loudspeakers, used to reinforce a given sound , e.g a person making a speech, pre-recorded music ,or message and distributing the sound throughout a venue . The voice signal is passed through a microphone , which converts the sound energy to electrical energy, the energy electrical signal being transmitted is been received and amplified by the amplifier circuit. The amplifier’s output is fed into the loudspeaker which converts the electrical energy back to the original form but amplified sound energy. This project is made up of the power supply unit, the pre-amplifier and power amplifier units, and the tone control unit. This system is capable of delivering 20W of electrical power into a 8 ohm load(loudspeaker).

TABLE OF CONTENTS
Certification Page------------------------------------------------------------------------ i
Dedication ---------------------------------------------------------------------------------ii
Acknowledgement------------------------------------------------------------------------iii
Abstract-------------------------------------------------------------------------------------iv
Table of contents---------------------------------------------------------------------------v
List of Table--------------------------------------------------------------------------------vii
List of figures------------------------------------------------------------------------------viii

CHAPTER 1: INTRODUCTION …………………………………………...1
1.1 BACKGROUND OF THE STUDY
1.2 Aims and Objectives……………………………………………..5
1.3 Justification ……………………………………………..6
1.4 Scope of project …………………………………………….7
1.5 System block diagram……………………………………………7
1.6 Project Work Organization ………………………………………8

CHAPTER 2: LITERATURE REVIEW ……………………………………9
2.1 Ancient medium of information transmission …………………….9
2.2 Modern day medium Approach …………………………………...9
2.2.1 Problems associated with earlier systems…………………..……10
2.2.2 Working principles of the modern systems………………………10
2.3 Public Address System…………………………………………..11
2.3.1 The transmitter system…………………………………………..12
2.3.2 The Receiver system…………………………………………….13
2.3.3 The Antenna……………………………………………………..14
2.3.3.1 Functions of Antenna……………………………………………15
2.3.4 The tone control and mixer stage………………………………..15
2.3.5 The audio amplifier……………………………………………..16
2.3.6 The loudspeaker…………………………………………………17
2.4 Modulation………………………………………………………17
2.4.1 Frequency modulation…………………………………………..18

CHAPTER 3: SYSTEM DESCRIPTION AND IMPLEMENTATION….19
3.1 Transistor power amplifier……………………………………….19
3.2 MOSFET power amplifier………………………………………..19
3.3 Bipolar junction transistor………………………………………...21
3.4 Operational Amplifier……………………………………………..23
3.4.1 Class A amplifier………………………………………………….24
3.5 Implementation Method…………………………………………..24

CHAPTER 4: CIRCUIT DESIGN AND ANALYSIS………………………...26
4.1 Power Supply unit design………………………………………….26
4.2 Transmitter design ………………………………………………..27
4.3 Amplifier circuit design…………………………………………....29
4.4 Receiver principles………………………………………………...31
4.5 Demodulation……………………………………………………...32
4.6 Transmitter circuitry…………………………………………….…33
4.7 The input stage…………………………………………………….34
4.8 Mixing stage………………………………………………………34
4.9 Audio power amplifier…………………………………………….36

CHAPTER 5: CONSTRUCTION AND TESTING…………………………37
5.1 The power supply …………………………………………………37
5.2 The output power amplifier………………………………………..37
5.3 Dissipation of excessive heat………………………………………38
5.4 Entire circuit testing………………………………………………..38
5.5 Performance Evaluation…………………………………………...38
5.6 Packaging……………………………………………………….....40

CHAPTER 6: CONCLUSION AND RECOMMENDATION……………..41
6.1 Bill of Engineering measurement and Evaluation (BEME)……….41
6.2 Problems Encountered and Solution……………………………….42
6.3 Audio feedback and prevention……………………………………43
6.5 Conclusion…………………………………………………………44
6.6 Recommendation / Reference ……………………………………44
DESIGN AND CONSTRUCTION OF 20WATTS WIRELESS PUBLIC ADDRESS SYSTEM

Share This

Details

Type Project
Department Electrical Engineering
Project ID ELE0176
Price ₦3,000 ($9)
No of Pages 44 Pages
Format Microsoft Word

500
Leave a comment...

    Details

    Type Project
    Department Electrical Engineering
    Project ID ELE0176
    Price ₦3,000 ($9)
    No of Pages 44 Pages
    Format Microsoft Word

    Related Works

    INTRODUCTION A public address system is an electronics sound amplification and distribution system with a microphone, amplifier and loud speaker used to allow a person to address a large public. The public address system consists of three main parts namely, the microphone (input transducer), amplifier and the loudspeaker (output transducer). The... Continue Reading
    ABSTRACT This project intended to simplify the description and working principle of FM wireless microphone, which works on a fixed frequency modulation (FM) band. TABLE OF CONTENTS Approval Sheet Title Page Dedication Acknowledgement Abstract CHAPTER ONE 1.0INTRODUCTION 1.1Aim and Objective of Investigation CHAPTER TWO 2.0Transmitter... Continue Reading
    ABSTRACT The purpose of this project is to design and construction of a central wireless switch for electrical and electronic appliances. A central wireless switch for electrical and electronic appliance is a GSM based online power control switch system that controls the entire appliance in the EEE general office using GSM network. It will act as... Continue Reading
    The aim of this project is to shows the possibility of wireless power transfer through the design of a wireless charging pad.  In this project write-up, the methodology and principle of operation is wireless power transfer through inductive couple, a feasible design is modelled accordingly. The inductive couple technique is used because it is the... Continue Reading
    ABSTRACT Construction of a potable electric operated motor vehicle for long Volvo Bus. In this project involves the knowledge of mechanical engineering workshop technology and engineering material science and strength. This was exactly... Continue Reading
    ABSTRACT Construction of a potable electric operated motor vehicle for long Volvo Bus. In this project involves the knowledge of mechanical engineering workshop technology and engineering material science and strength. This was exactly what we were taught. We contracted the electric car with the actual dimension of long Volvo bus(Ml-) got from the... Continue Reading
    ABSTRACT This project topic “Secured Wireless Network” was carried out with a view to deploying effective security for wireless networks. The project developed a system that lets typical users easily build a highly secured wireless network. My aim is to show how user interface can be applied to provide a complete solution for securing wireless... Continue Reading
    ABSTRACT This project is he design and construction of a voltage inverter system with trickle charging system. This device is design to provide power supply for the need of offices, household etc. In absence of NEPA power supply. It would also prevent harm to our appliances caused by power holding company LTD (NEPA) Random power outage . TABLE OF... Continue Reading
    ABSTRACT This project is he design and construction of a voltage inverter system with trickle charging system. This device is design to provide power supply for the need of offices, household etc. In absence of NEPA power supply. It would also prevent harm to our appliances caused by power holding company LTD (NEPA) Random power outage . TABLE OF... Continue Reading
    (A CASE STUDY OF NOKIA) TABLE OF CONTENTS Title page         -       -       -       -       -       -       -      -       i Certification... Continue Reading