Design And Construction Of A Multipurpose Listening Device
ABSTRACT
This multipurpose listening device can detect very faint, remote sounds with a good clarity. It is useful in large conference halls, auditoria, cinema halls, lecture rooms in colleges, etc. The circuit can be housed in a small plastic box and kept in a shirt pocket. It is especially useful for watching TV programs at a low volume so as not to disturb other family members in the house.
An electric microphone is used to pick up sounds. The advantages of using it are its excellent frequency range and high sensitivity. Four transistors and a few resistors and capacitors are required for fabricating the circuit.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE PROJECT
1.2 AIM OF THE PROJECT
1.3 OBJECTIVE OF THE PROJECT
1.4 SIGNIFICANCE OF THE PROJECT
1.5 PURPOSE OF THE PROJECT
1.6 APPLICATION OF THE PROJECT
1.7 ADVANTAGES OF THE PROJECT
1.8 PROBLEM/LIMITATION OF THE PROJECT
1.9 PROJECT ORGANISATION
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 OVERVIEW OF THE STUDY
2.2 USES OF THE STUDY
2.3 REVIEW OF CANDIDACY AND ACQUISITION OF THE STUDY
2.4 REVIEW OF DIFFERENT TYPES OF MULTIPURPOSE LISTENING DEVICES
2.5 HISTORICAL BACKGROUND OF MULTIPURPOSE LISTENING DEVICE
CHAPTER THREE
3.0 METHODOLOGY
3.1 BLOCK DIAGRAM
3.2 SYSTEM OPERATION AND DESCRIPTION
3.3 SYSTEM CIRCUIT DIAGRAM
3.5 DESCRIPTION AND FUNCTION OF THE MAJOR COMPONENTS USED IN THIS CIRCUIT
CHAPTER FOUR
RESULT ANALYSIS
4.0 CONSTRUCTION PROCEDURE AND TESTING
4.1 CASING AND PACKAGING
4.2 ASSEMBLING OF SECTIONS
4.3 TESTING
4.4.1 PRE-IMPLEMENTATION TESTING
4.4.2 POST-IMPLEMENTATION TESTING
4.5 RESULT
4.6 COST ANALYSIS
4.7 PROBLEM ENCOUNTERED
CHAPTER FIVE
5.1 CONCLUSION
5.2 RECOMMENDATION
5.3 REFERENCE
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND TO THE STUDY
Hearing is one of the five senses along with vision, taste, smell and touch. The ear serves as a receiver of incoming sounds. Although the ear receives sound and is the sense organ for hearing, it is the brain and central nervous system that interpret the sound. The human auditory system can generally hear sounds within the frequency range of 20 Hz and 20 kHz but the frequency range between 100Hz and 6 kHz contains most of the information of human voice (Sergei Kochkin, 2015). Although the sensation of hearing requires an intact and functioning auditory portion of the central nervous system as well as working ear, human deafness (extreme insensitivity to sound) and hearing loss most commonly occur because of damages of the ear, rather than the central auditory system.
A multipurpose listening device is a small device used for amplifying low audio signal. This multipurpose listening device can detect very faint, remote sounds with a good clarity.
The basic components of a multipurpose listening device are a microphone, transistors – for amplification, a headphone, and 3v battery. The microphone converts the sound into an electric signal. The signal then undergoes conditioning that can be as simple as amplifying all of the sound equally, to more advanced equalization involving a digital signal processor. The headphone receives the output, and the battery powers the electronics (Schum, D.J. 2004).
1.2 OBJECTIVE OF THE PROJECT
The objective of this work is to design an electro-acoustic device which amplifies sound for the wearer, usually with the aim of making speech more intelligible, and audible.
1.3 SIGNIFICANCE OF THE PROJECT
Hearing aids are incapable of truly correcting a hearing loss; they are an aid to make sounds more accessible. The circuit can be housed in a small plastic box and kept in a shirt pocket. It is especially useful for watching TV programs at a low volume so as not to disturb other family members in the house.
1.4 SCOPE OF THE PROJECT
Multipurpose listening device help people who have hearing loss. This multipurpose listening device circuit works using four transistors and several passive electronic components.
1.5 LIMITATION OF THE PROJECT
Some multipurpose listening device comes with non-replaceable battery which can only be dispose when the battery dies, this means that multipurpose listening device with non-replaceable battery can be costly than the one that has replaceable battery because if the battery dies one have to dispose it. Multipurpose listening device can be noisy when the battery gets low.
1.6 APPLICATION OF THE PROJECT
It is useful in large conference halls, auditoria, cinema halls, lecture rooms in colleges, etc.
1.7 METHODOLOGY
To achieve the aim and objectives of this work, the following are the steps involved:
- Study of the previous work on the project so as to improve it efficiency.
- Draw a block diagram.
- Test for continuity of components and devices,
- Design and calculation for the device was carried out.
- Studying of various component used in circuit.
- Construction of the circuit was carried out.
- Finally, the whole device was cased and final test was carried out.
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 this work. In this chapter, the background, significance, objective limitation and problem of this work were discussed.
Chapter two is on literature review of this work. 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.
The Title Page should be the first section of your project “Design And Construction Of A Multipurpose Listening Device”, providing essential details like the project title, your name, your supervisor’s name, the institution, and the submission date. After that, the Abstract offers a brief summary of your project, touching on its purpose, methods, results, and conclusions in 150-300 words. The Acknowledgments section is where you can thank those who supported your research, such as your supervisor, peers, or organizations that provided resources.
Next, the Table of Contents organizes the Design And Construction Of A Multipurpose Listening Device by listing its chapters and sections, along with page numbers for easy reference. The List of Figures and List of Tables help guide readers to specific visual elements like graphs, charts, or tables included in the document. There should also be an Abbreviations and Glossary section to explain any specialized terms or acronyms, making the content clearer to readers unfamiliar with the technical language.
The main body of the Design And Construction Of A Multipurpose Listening Device should start with the Introduction, which provides background information, outlines the research problem, states your objectives, and gives a brief overview of your research methods. Following that, the Literature Review offers an in-depth look at previous research relevant to your project, identifying gaps your study aims to address. The Methodology section then explains the research design, tools, and data collection methods you used to conduct the project and analyze the data.
In the Results and Discussion section, you present your findings and discuss them in relation to the Design And Construction Of A Multipurpose Listening Device research questions or objectives, often using tables or charts to help explain the data. The Conclusion summarizes the key results, discusses their implications, and suggests possible directions for future research. You may also include recommendations based on your findings, offering practical advice for improvements or applications. Finally, the Design And Construction Of A Multipurpose Listening Device project should include a References or Bibliography section to list all the sources you cited, as well as Appendices for any additional material. A Statement of Originality is often included to confirm the authenticity of your work