USER'S INSTRUCTIONS: The project work you are about to view is on " design and construction of an electronics lectern/podium". Please, sit back and study the below research material carefully. This project topic ( design and construction of an electronics lectern/podium) 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 an electronics lectern/podium" 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 an electronics lectern/podium" research materials. We are not encouraging any form of plagiarism. This service is legal because, all institutions permit their s[tudents to read previous projects, books, articles or papers while developing their own works.
TITLE PAGE
DESIGN AND CONSTRUCTION OF AN ELECTRONICS LECTERN/PODIUM
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 an electronics lectern/podium" 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 an electronics lectern/podium" 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 an electronics lectern/podium" visible for everyone, then the complete material on "
design and construction of an electronics lectern/podium" is to be ordered for. Happy viewing!!!
This work is on a mobile electronic lectern/podium which is an integration of PC and audio visual equipments, which makes a classroom and presentation hall interactive. An electronic lectern consists of an Audio system which includes amplifier, speakers and microphones and ports are available for CD, DVD, USB, MP3 connection as per customer's requirement. This aim of work is to build a reading desk which composes of public addressing system with wireless microphone which can be used to address audience.
TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
CHAPTER ONE: INTRODUCTION
1.0. |
Background of study |
1.1. |
Problem statement |
1.2. |
General Objectives |
1.3. |
Specific Objectives |
1.4. |
Scope of study |
1.5. |
Significance of study |
1.6. |
Limitations |
1.7. |
Organization of Chapter |
CHAPTER |
TWO: LITERATURE REVIEW |
2.0. |
Lectern |
2.1. |
Applications of lecterns |
2.2. |
Sound Powered lecterns |
2.2.1. |
SL400 - Sound Powered Lectern |
2.2.2. |
SL370 Table Top Sound Lectern |
2.2.3. |
The Executive Sound Column Lectern |
CHAPTER |
THREE: METHODOLOGY |
3.1. |
Materials |
3.1.1. |
JRC4558 |
3.1.2. |
Mid-Range PC Board Relays |
3.1.3. |
C945 NPN Transistor |
3.1.4. |
Cordless Microphone Module |
3.2. |
Designing |
3.2.1. |
Designing of System Device Block Diagram |
3.2.2. |
Design of System Device Circuit |
3.3 |
Construction |
3.3.1. |
Construction of the Class AB Power Amplifier |
3.3.2. |
Split Power Supply |
3.3.3. |
Tone Control Circuit. |
3.3.4. |
Four Channel Audio Mixer |
3.4. |
Mode of operation of system device |
3.5 |
System Design |
3.5.1 |
System Device Block Diagram |
3.5.2. |
System device circuit |
3.5.3 |
System Development |
CHAPTER |
FOUR: RESULTS AND DISCUSSION |
4.0. |
Characteristics of Sound |
4.0.1. |
Noise Level and Sound Pressure Level (SPL) |
4.0.2. |
Sound Pressure Level Decreases with Distance |
4.0.3. |
Sound Reverberation and Absorption |
4.1. |
Discussion |
4.2. |
Costs Benefits Analysis |
4.2.1 |
Material list |
4.2.2 |
Labour cost |
CHAPTER |
FIVE: CONCLUSION AND RECOMMENDATION |
5.0 |
Conclusion |
5.1 |
Recommendations |
REFEREENCES
GLOSSARY
LIST OF TABLES
LIST OF FIGURES
CHAPTER ONE
INTRODUCTION
1.1 Background of study
A lectern is the slanted-top high-desk that you as the speaker stand behind and use when reading your presentation notes. A lectern is also known as podium is a raised platform on which a speaker stands during a presentation. The reading lectern is wide and deep providing over 12² inches of usable surface. A mobile electronic lectern is a portable type of lectern that is used for voice reinforcement in conference and meeting rooms, auditoriums, churches, hotels, motels, schools, meeting halls, etc. This system is the combination of microphones, signal processors, amplifiers, and loudspeakers that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience [1].
An electronic lectern system is also used to enhance the sound of the sources on a stage. A sound reinforcement system may be very complex, including hundreds of microphones, complex audio mixing and signal processing systems, tens of thousands of watts of amplifier power, and multiple loudspeaker arrays, all overseen by a team of audio engineers and technicians. On the other hand, a sound reinforcement system can be as simple as a small public address (PA) system, consisting of a single microphone connected to an amplified loudspeaker. In both cases, these systems reinforce sound to make it louder or distribute it to a wider audience.
The result is superb voice reproduction with a minimum of reverberation. Additional features include: unidirectional dynamic microphone, shock-mount holder for the microphone, input for
second microphone, output for tape or external PA system, output for external speaker, speech equalizer with switch, auxiliary input, volume and tone controls [2].
An electronic lectern would effectively cover audiences of 2500 or more indoor. Lecterns used in academia generally in seminar rooms and lecture theatres may have certain features that common lecterns lack, based on the technological sophistication of the venue. Lecterns of this sort are generally attached or integrated into a large desk, as the amount of support material tends to be larger in academic contexts than in straightforward public talks. In a church, the lectern is usually the stand on which the Bible rests and from which the "lessons" (reading from Scripture) are read during the service. The lessons may be read or chanted by a priest, deacon, minister, or layperson, depending upon the liturgical traditions of the community. The lectern is normally set in front of the pew, so that the reader or speaker faces the congregation [3].
1.2 Problem Statement
Setting up loudspeakers, amplifier and microphones with limited time whenever audience need to address causes lots of stress and complexity. One can imagine the stress that it entails, especially with the margin of error being large enough to cause misconnection that could lead to damage of the system. Lectern in these modern days in almost every auditorium has one way or the other become a necessity as it serves as a slim table besides which a group of people could be addressed from. The powered lectern combines the whole setup into one unit which makes it convenient to be fixed anywhere public address and lecterns are needed.
1.3 Objectives of the study
General Objectives
The general objective of this project is to design and construct a portable electronic lectern with a wireless microphone.
- Specific Objectives
Specifically, the system device would be able to:
- Produce sound for in-and-out door purposes.
1.4 Scope of study
Audio sources like dynamic microphones, MP3, Compact Disc players are considered based on their decibel and impedance and a 3 channel audio mixer is designed. The channels are well labeled for clarity of sources which require pre-amplification. The JRC4558 dual Operational amplifier is used to design a number class ‘A’ amplifiers which is used to balance sound levels. Active high and low filters are used as equalization of sound to improve on the frequency response of the signal from the mixing stage before further amplified by the class ‘AB’ power amplifier to the loud speakers. The input connectors would be mounted on the front panel and then connected to the three audio channel mixer. The mixer would source its power from the split power supply via a 12volts regulator. The output of the mixer would directly be amplified by an inbuilt class ‘AB’ power amplifier. The loudspeakers are arranged in a format that ensures that the total impedance is between 4-16 ohms.
1.5 Significance of study
The significance of this project are as follows:
- Accessible shelves inside a lectern allow for the convenient storage of lecturers’ pointers, papers, and laptop computers while keeping the paraphernalia out of sight until it’s ready for use.
- Swift set-up requiring little or no expertise in setting up.
- Built-in storage space gives the presenter and the presentation space a more professional look.
- It has a 50 Watt inbuilt Amplifier.
- It has an LED Light for reading.
- It is designed to support an Anti-shock with gooseneck microphone holder for unidirectional Dynamic microphone.
- It has a Mic/Aux Volume, Speech Filter and Tone Control.
- It has two 6’’ loudspeakers with connection for External Speaker
1.6 Limitations of the study
Basic limitation of the construction of this project is that:
- Quality of electrical and electronics components in terms of its grade.
- The cost of producing a single unit of this project is relatively expensive since the prices of electronics components are cheaper when bought in a high quantity.
- Inadequate time and the high outages of power also amount in many challenges in coming out with a much more refined project.
- The difficulties involved in getting the major components from class A source was very difficult because all the companies who manufactures these components do not sell components in small quantities and it was very hectic getting all these components.
1.6 Organization of the Study
The work is organized as follows: chapter one discuses the introductory part of the work, chapter two presents the literature review of the study, chapter three describes the methods applied, chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendations.CHAPTER TWO: The chapter one of this work has been displayed above. The complete chapter two of " design and construction of an electronics lectern/podium" is also available. Order full work to download. Chapter two of " design and construction of an electronics lectern/podium" consists of the literature review. In this chapter all the related work on " design and construction of an electronics lectern/podium" was reviewed.
CHAPTER THREE: The complete chapter three of " design and construction of an electronics lectern/podium" is available. Order full work to download. Chapter three of " design and construction of an electronics lectern/podium" 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 an electronics lectern/podium" is available. Order full work to download. Chapter four of " design and construction of an electronics lectern/podium" 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 a " design and construction of an electronics lectern/podium" is available. Order full work to download. Chapter five of " design and construction of an electronics lectern/podium" 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:
