Design And Construction Of A 4-Channel Audio Mixer
An audio mixer is an electronic device for combining, and modifying audio signals. The modified audio signals are summed to produce some combined output signals. This project is titled design and construction of a 4-channel microphone mixer. A microphone mixer is an electronic console that is used to mix different recorded tracks by changing their volume levels, adding effects and changing the timbre of each instrument on the tracks. Audio mixers are also called mixing consoles and soundboards. Mixers are most often used by recording studios but are also typically used in live situations by live sound engineers.
There are two types of mixers, digital and analog, and both are commonly used by the same recording studio to achieve different results.In this work, an analog audio mixer using common electronics components, such as resistors, capacitors, potentiometers and operational amplifiers (Op-Amps).
The aim of this work is to design and construct a 4-channel mixer which can accept four different audio input at the same time and mix their different tracks by changing their volume levels, adding effects and changing the timbre of each instrument on the tracks.
CHAPTER ONE
1.1 INTRODUCTION
1.2 BACKGROUND OF THE STUDY PROJECT
1.3 STATEMENT OF THE PROBLEM
1.4 RESEARCH OBJECTIVE /AIM
1.5 LIMITATION SCOPE OF PROJECT
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 A BRIEF ONLINE OF THE CHAPTER
2.2 HISTORICAL BACKGROUND OF THE PROJECT STUDY
2.3 THEORIES CONCEPT RELEVANT TO THE RESEARCH
CHAPTER THREE
3.0 RESEARCH METHODOLOGY
3.1 A BRIEF OUTLINE OF THE CHAPTER
3.2 RESEARCH DESIGN
3.3 BLOCK BY BLOCK
CHAPTER FOUR
4.0 PRINCIPLE OF OPERATION OF PROJECT
4.1 BRIEF INTRODUCTION OF THE CHAPTER
4.2 PRINCIPLE OF OPERATION OF THE PROJECT (FOR CASE STUDIES )
4.3 EXPLANATION OF THE VARIOUS UNITS BLOCK IN THE PROJECT (FOR CASE STUDIES )
CHAPTER FIVE
5.0 CONSTRUCTION OF THE DESIGNED PROJECT
5.1 A BRIEF OUTLINE OF THE CHAPTER
5.2 CHOICE OF MATERIALS
5.3 CONSTRUCTION OF THE PROJECT
5.4 BEME TABLE (FOR CASE STUDIES )
5.5 TEST RESULT OF TESTS
CHAPTER SIX
6.0 CONCLUSION SUMMARY AND/OR RECOMMENDATION
6.1 SUMMARY OF THE STUDY PROJECT CHAPTER BY CHAPTER
6.2 PROBLEM ENCOUNTERED
6.3 RECOMMENDATION
6.4 SUGGESTION FOR FURTHER STUDIES
ABSTRACT
An audio mixer is an electronic device for combining, and modifying audio signals. The modified audio signals are summed to produce some combined output signals. This project is titled design and construction of a 4-channel microphone mixer. A microphone mixer is an electronic console that is used to mix different recorded tracks by changing their volume levels, adding effects and changing the timbre of each instrument on the tracks. Audio mixers are also called mixing consoles and soundboards. Mixers are most often used by recording studios but are also typically used in live situations by live sound engineers.
There are two types of mixers, digital and analog, and both are commonly used by the same recording studio to achieve different results.
In this work, an analog audio mixer using common electronics components, such as resistors, capacitors, potentiometers and operational amplifiers (Op-Amps).
The aim of this work is to design and construct a 4-channel mixer which can accept four different audio input at the same time and mix their different tracks by changing their volume levels, adding effects and changing the timbre of each instrument on the tracks.
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE STUDY PROJECT
Audio mixer is an electronic device for combining (also called “mixing”), routing, and changing the level, timbre and/or dynamics of audio signals. A mixer can mix analog or digital signals, depending on the type of mixer. The modified signals (voltages or digital samples) are summed to produce the combined output signals.
Mixing mixers are used in many applications, including recording studios, public address systems, sound reinforcement systems, broadcasting, television, and film post-production. An example of a simple application would be to enable the signals that originated from two separate microphones (each being used by vocalists singing a duet, perhaps) to be heard through one set of speakers simultaneously. When used for live performances, the signal produced by the mixer will usually be sent directly to an amplifier, unless that particular mixer is “powered” or it is being connected to powered speakers. Among the highest quality bootleg recordings of live performances are the so-called soundboard recordings that are sourced from this mixer output to the speakers.
Prior to the emergence of digital audio workstations (DAWs), the process of mixing used to be carried out on a mixing console. Currently, more and more engineers and independent artists are using a personal computer for the process. Mixing consoles still play a large part in the recording process. They are often used in conjunction with a DAW, although the DAW may only be used as a multitrack recorder and for editing or sequencing, with the actual mixing being performed on the mixer.
1.3 STATEMENT OF THE PROBLEM
In music industry, selection of different audio input to produce one output is always a problem in that it involves much labour. Mixers allow for precise tuning of mic inputs and speaker outputs. The result is clearer sound, and more volume from the sound system before feedback occurs.
1.4 RESEARCH OBJECTIVE /AIM
The objective of this work is to design an audio device which have and can accept four different audio inputs then with only one output. And the level of each audio input is controlled with potentiometer.
1.5 LIMITATION AND SCOPE OF PROJECT
This device was built using lm381 operational amplifier. Each of the amplifiers of lm381 is completely independent, with individual internal power supply decoupler-regulator, providing 120 dB supply rejection and 60 dB channel separation. Other outstanding features include high gain (112 dB), large output voltage swing (VCC b 2V) p-p, and wide power bandwidth (75 kHz, 20 Vp-p). High gain op amp combines up to four individually controlled input signals.
The Title Page should be the first section of your project “Design And Construction Of A 4-Channel Audio Mixer”, 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 4-Channel Audio Mixer 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 4-Channel Audio Mixer 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 4-Channel Audio Mixer 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 4-Channel Audio Mixer 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