DESIGN AND CONSTRUCTION OF 40WATTS WIRELESS PUBLIC ADDRESS SYSTEM
USER'S INSTRUCTIONS: The project work you are about to view is on "design and construction of 40watts wireless public address system". Please, sit back and study the below research material carefully. This project topic "design and construction of 40watts wireless public address system" have complete 5(five) Chapters. The complete Project Material/writeup include: Abstract + Introduction + etc + Literature Review + methodology + etc + Conclusion + Recommendation + References/Bibliography.Our aim of providing this"design and construction of 40watts wireless public address system"project research material is to reduce the stress of moving from one school library to another all in the name of searching for"design and construction of 40watts wireless public address system"research materials. We are not encouraging any form of plagiarism. This service is legal because, all institutions permit their students to read previous projects, books, articles or papers while developing their own works.
TITLE PAGE
BY
---
--/H2013/01430
DEPARTMENT OF ----
SCHOOL OF ---
INSTITUTE OF ---
DECEMBER,2018
APPROVAL PAGE
This is to certify that the research work,"design and construction of 40watts wireless public address system"by ---, Reg. No. --/H2007/01430 submitted in partial fulfillment of the requirement award of a Higher National Diploma on --- has been approved.
By
--- . ---
Supervisor Head of Department.
Signature………………. Signature……………….
……………………………….
---
External Invigilator
DEDICATION
This project is dedicated to Almighty God for his protection, kindness, strength over my life throughout the period and also to my --- for his financial support and moral care towards me.Also to my mentor --- for her academic advice she often gives to me. May Almighty God shield them from the peril of this world and bless their entire endeavour Amen.
ACKNOWLEDGEMENT
The successful completion of this project work could not have been a reality without the encouragement of my --- and other people. My immensely appreciation goes to my humble and able supervisor mr. --- for his kindness in supervising this project.
My warmest gratitude goes to my parents for their moral, spiritual and financial support throughout my study in this institution.
My appreciation goes to some of my lecturers among whom are Mr. ---, and Dr. ---. I also recognize the support of some of the staff of --- among whom are: The General Manager, Deputy General manager, the internal Auditor Mr. --- and the ---. Finally, my appreciation goes to my elder sister ---, my lovely friends mercy ---, ---, --- and many others who were quite helpful.
PROJECT DESCRIPTION: This work"design and construction of 40watts wireless public address system"research material is a complete and well researched project material strictly for academic purposes, which has been approved by different Lecturers from different higher institutions. We made Preliminary pages, Abstract and Chapter one of "design and construction of 40watts wireless public address system" visible for everyone, then the complete material on"design and construction of 40watts wireless public address system"is to be ordered for. Happy viewing!!!
This work is on a 40w wireless public addressing system. 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 public address system (PA system) is an electronic sound amplification and distribution system with a microphone, amplifier and loudspeakers, used to allow a person to address a large public, for example for announcements of movements at large and noisy air and rail terminals. Public addressing system is often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations. Intercom systems, installed in many buildings, have microphones in many rooms allowing the occupants to respond to announcements.
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 output 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 40W of electrical power into an 8 ohm load (loudspeaker).
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRCT
TABLE OF CONTENT
CHAPTER ONE
- INTRODUCTION
- BACKGROUND OF THE PROJECT
- PROBLEM STATEMENT
- AIM/OBJECTIVE OF THE PROJECT
- SIGNIFICANCE OF THE PROJECT
- APPLICATION OF THE PROJECT
- LIMITATION OF THE PROJECT
- SCOPE OF THE PROJECT
- PROJECT JUSTIFICATION
- PROJECT ORGANISATION
CHAPTER TWO
LITERATURE REVIEW
2.0 LITERATURE REVIEW
2.1 REVIEW OF PUBLIC ADDRESSING SYSTEM
2.2 HISTORICAL BACKGROUND OF PUBLIC ADDRESSING SYSTEM
2.4 DIFFERENT TYPES PUBIC ADDRESSING SYSTEM
CHAPTER THREE
3.0 CONSTRUCTION METHODOLOGY
3.1 BLOCK DIAGRAM OF THE SYSTEM
3.2 CIRCUIT DIAGRAM
3.3 CIRCUIT DESCRIPTION
3.4 SYSTEM OPERATION
3.5 DESCRIPTION OF MAJOR COMPONENTS USED
CHAPTER FOUR
RESULT ANALYSIS
4.1 CONSTRUCTION PROCEDURE AND TESTING
4.2 CASING AND PACKAGING
4.3 ASSEMBLING OF SECTIONS
4.4 TESTING OF SYSTEM OPERATION
4.5 COST OF PRODUCTION
CHAPTER FIVE
- CONCLUSIONS
- RECOMMENDATION
5.3 REFERENCES
CHAPTER ONE
- INTRODUCTION
A public address system allows you to broadcast information to a large group of people, whether you are giving a speech or playing live or recorded music. Public address systems typically consist of input sources, preamplifiers, control and monitoring equipment, and loudspeakers. Input sources refer to the microphones that provide a sound input for the system (Bruce, 2013). These input sources are fed into the preamplifiers. The pre amplified signals are then passed into the audio power amplifiers.
These amplifiers will amplify the audio signals to an adequate speaker line level. In view of the above, one can now say that the public address system is an electronic amplification system used for communication in public areas
1.1 BACKGROUND OF THE PROJECT
A public address system comprises electrical equipment to greatly amplify a speaker's voice so it will reach a much larger assemblage than he could speak to unaided. Beginning with the presidential conventions of the two major parties in 1920 and the inaugural address of President Harding in March 1921, when a special address system installed by the telephone engineers enabled him to address an audience estimated at 125,-000, there followed in rapid succession, many public events demonstrating the value of such systems. One of the most notable of these occurred on Armistice Day 1921, when the speeches, prayers and music at Arlington, Virginia, were heard, not only by 100,000 persons gathered there at the National Cemetery, but by some 35,000 in New York City and 20,000 in San Francisco. On this occasion the three public address systems, one for each of these cities, were joined by long distance telephone circuits.
The fundamental requirements of a satisfactory public address system are naturalness of reproduction and wide range of output volume. The meeting of these two requirements for music proves more difficult than for speech.
The public address system here described is most readily considered in three sections—“pick-up” apparatus which is placed in the neighborhood of the speaker and converts his words into undulatory electric currents; a vacuum tube amplifier for amplifying these currents; and a “receiver-projector” for reconverting the current into sound waves and distributing the sound over all of the audience. In the present system each of these three parts of the equipment has been designed with the intention of making it as nearly distortionless as possible, so that the various parts might be adaptable for audiences ranging in size from possibly one thousand to several hundred thousand, and might also be used in connection with the long distance telephone lines and with either radio broadcasting or receiving stations (Bruce, 2013).
The pick-up device whether of the carbon microphone variety or a condenser transmitter need not be placed close to the speaker's lips but will operate satisfactorily when four or five feet away. The loud-speaking receiver mechanism is so designed that it will carry a power of several watts with small distortion.
1.2 PROBLEM STATEMENT
This project is to overcome communication problems that usually occur in areas where it is hard to find a device for making important announcements or speeches so that everyone can listen precisely to what the speaker is talking about. This simple project may also be used by lecturers in lecture halls to bridge communication gap between the lecturers and student in a lecture, as shouting during lectures may be very exhausting.
1.2 AIM OBJECTIVE OF THE PROJECT
This study is aimed at constructing a wireless public addressing system. The objectives are:
- To build the system prototype
- To find a better means of addressing the public wirelessly
- To construct a wireless public address system with relatively unique operational characteristics that is capable of delivering 40 watts of electrical power into an 8 Ohms load (loudspeaker).
1.3 SIGNIFICANCE OF THE STUDY
Public addressing system is often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations. Public addressing system is naturalness of reproduction and wide range of output volume. The meeting of these two requirements for music proves more difficult than for speech.
This system enables the speaker or host to convey the desired message in an audible manner to all the guests/visitors. The volume calibration can be in accordance with the venue’s capability. Venue types can be an open ground stage or an enclosed auditorium.
Loudness generates an automatic response in any crowd to pay attention to the voice. This enables the speaker to make important announcements effectively. This also allows them to give instructions clearly.
With this Wireless and Infrared PA Systems, installations become easy like never before. It greatly reduces wiring and position issues. You can place the devices anywhere within range. All you need to do, is just place and switch it on, and you are all set to go!
In a high populated area, it is important to evacuate everyone safely in a case of emergency. Provision of proper and immediate instructions is great way to evacuate everyone safely and quickly. Our PA system helps you to deliver loud and clear instructions to all your employees, ensuring that they clear the area without panicking.
1.4 APPLICATION OF THE PROJECT
Public addressing system is often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings and locations.
1.5 PROJECT JUSTIFICATION
Over the ages, science and technology has been developing with new inventions in various fields; including the increase in modifications on existing technology all gearing towards improving effectiveness and reliability of equipment and achieving to a great degree miniaturization and optimal cost.
This project is backed by my interest in the area of electronics and communication, and having been groomed to a great extent with introductions into the various fields of electrical and electronics engineering, with the knowledge in principles of telecommunications, telecommunication engineering.
1.6 SCOPE OF THE PROJECT
the scope of this work covers building a wireless public addressing system that is capable of delivering 40 watts of electrical power into an 8 Ohms load (loudspeaker). This will be achieved with adequate tone controls and mixer stages so as to enable communication or reproduction of speech and recorded music in buildings and institutions. In this work, the transmitter communicates with the receiver wirelessly.
This system is for public address; it has an estimated power rating of 40watts. For power supplies, it uses a 220/12Vac transformer for the receiver, amplifier and loudspeaker units. It has a power On/Off button with volume control while the transmitting side uses 9v battery.
1.7 LIMITATION OF THE PROJECT
INTERFERENCE: Interference can be a problem. There are lots of devices that emit radio waves. If those radio waves are on the same frequency as with the transmitter and receiver, you could get some garbled signals as you listen to the output. Dropped signals can also be an issue -- if a transmitter or receiver stops working or drops out, it will affect your listening experience.
BANDWIDTH: Another problem is bandwidth. Wired PA can carry a lot of information in the form of electrical signals. Wireless signals can't really compete. Audio may seem less full or rich. It's a subjective element that can be difficult to put into words. If you're an audiophile, you may find wireless PA lacking from a performance standpoint.
1.8 PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to solar power inverter. In this chapter, the background, significance, objective limitation and problem of solar power inverter were discussed.
Chapter two is on literature review of solar power inverter. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.
CHAPTER FIVE
5.1 CONCLUSION
Wireless Public address systems are an essential tool in communication throughout a premises or campus. Clear View has nearly 20 years experience of manufacturing, installing and servicing a wide range of audio and public address equipment.
Public address systems can broadcast information from single or multiple sources to large groups of people in:
- Specific areas of a building – “zones”
- All areas of a building – “all call”
Messages are sent from an operator via a microphone console or telephone handset and are routed through amplifiers before being distributed from speakers in the designated areas. PA Systems can distribute music into work places from digital media or radio.
It has been proven to be the fastest and safest method of evacuation because it delivers an emergency attention drawing signal followed by a recorded message, whilst also delivering live emergency announcements from the fire officer.
Standard facilities available on PA systems include:
- Routine paging announcements
- Background music,
- Interfaces to other devices
- Spot announcements
If a new public address system is required, our implementation process includes:
- Examining your public address specification requirements, including minimum sound pressure levels and post installation speech intelligibility testing eg. STI or RASTI testing
- Providing a detailed evaluation of the space that the PA system will serve
- Seeking compliance with any performance specification and / or relevant standards.
If a public address system has already been installed, we will undertake commissioning exercises to determine the electro-acoustic performance of the system. This is likely to include measurements of speech intelligibility and audibility testing.
5.2 RECOMMENDATION
This project is designed to be used in homes and industries and wherever the need for Public addressing. And should be used and maintain by a qualified personnel.
CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of"design and construction of 40watts wireless public address system"is also available. Order full work to download. Chapter two of"design and construction of 40watts wireless public address system"consists of the literature review. In this chapter all the related work on "design and construction of 40watts wireless public address system" was reviewed.
CHAPTER THREE: The complete chapter three of "design and construction of 40watts wireless public address system"is available. Order full work to download. Chapter three of"design and construction of 40watts wireless public address system" consists of the methodology. In this chapter all the method used in carrying out this work was discussed.
CHAPTER FOUR: The complete chapter four of "design and construction of 40watts wireless public address system" is available. Order full work to download. Chapter four of "design and construction of 40watts wireless public address system" consists of all the test conducted during the work and the result gotten after the whole work
CHAPTER FIVE: The complete chapter five of "design and construction of 40watts wireless public address system" is available. Order full work to download. Chapter five of "design and construction of 40watts wireless public address system" consist of conclusion, recommendation and references.
To "DOWNLOAD" the complete material on this particular topic above click "HERE"
Do you want our Bank Accounts? please click HERE
To view other related topics click HERE
To "SUMMIT" new topic(s), develop a new topic OR you did not see your topic on our site but want to confirm the availiability of your topic click HERE
Do you want us to research your new topic? if yes, click "HERE"
Do you have any question concerning our post/services? click HERE for answers to your questions
For more information contact us through any of the following means:
Mobile No 
:+2348146561114 or +2347015391124 [Mr. Innocent]
Email address 
:engr4project@gmail.com
Watsapp No 
:+2348146561114
COUNTRIES THAT FOUND OUR SERVICES USEFUL
Australia, Botswana, Canada, Europe, Ghana, Ireland, India, Kenya, Liberia, Malaysia, Namibia, New Zealand, Nigeria, Pakistan, Philippines, Singapore, Sierra Leone, South Africa, Uganda, United States, United Kindom, Zambia, Zimbabwe, etc
Support: +234 8146561114 or +2347015391124
Watsapp No :+2348146561114
Email Address :engr4project@gmail.com
FOLLOW / VISIT US VIA:
