Design And Construction Of An Amplifier With Bluetooth Speaker And Mic Unit

Amplifier with Bluetooth stereo audio system—one that’s also fairly low-cost—for outdoor use. This device provide the easiest way to play music off your smartphone to a speaker unit. The system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection and a music player or with an Apple iPod model. Bluetooth technology, created in the late 1990s, is widely used to establish a short-range wireless connection between two handheld mobile devices. A Bluetooth setup also makes it possible to transfer a stereo audio signal from a handheld device to a speaker unit . Today’s Bluetooth headsets operate under the Bluetooth Class 2 specification with 2.5-mW (4 dBm) transmission power. A Bluetooth Class 2 module’s transmission range extends to about 10 meters.

TABLE OF CONTENTS

COVER PAGE

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWELDGEMENT

ABSTRACT

CHAPTER ONE

INTRODUCTION

1.1      BACKGROUND OF THE PROJECT

• OBJECTIVE OF THE PROJECT
• SIGNIFICANCE OF THE PROJECT
• LIMITATION OF THE PROJECT
• SCOPE OF THE PROJECT
• APPLICATION OF THE PROJECT

CHAPTER TWO

LITERATURE REVIEW

• REVIEW OF BLUETOOTH TECHNOLOGY
• ORIGIN OF BLUETOOTH
• ETYMOLOGY OF BLUETOOTH
• IMPLEMENTATION OF BLUETOOTH
• COMMUNICATION AND CONNECTION
• USES OF BLUETOOTH

CHAPTER THREE

SYSTEM DESIGN

• BLUETOOTH BASICS
• BLOCK DIAGRAM OF THE SYSTEM
• OUTPUT POWER OF THE WORK
• SELECTING THE BLUETOOTH HEADSET, ON/OFF SWITCH, AND LEDS
• BUILDING SYSTEM

 

CHAPTER FOUR

TESTING AND RESULTS

• CONSTRUCTION PROCEDURE AND TESTING
• INSTALLATION OF THE COMPLET DESIGN
• CASING AND PACKAGING
• ASSEMBLING OF SECTIONS
• TESTING OF SYSTEM OPERATION
• ASSEMBLING THE SYSTEM
• TESTING OF THE SYSTEM
• PROBLEM ENCOUNTERED
• COST ANALYSIS
• PRECAUSIONS

CHAPTER FIVE

• CONCLUSION
• REFERENCES

CHAPTER ONE

1.1                                                        INTRODUCTION

Under normal circumstances, speakers and microphone need a cable linking them to an audio source (be that cable a pair of speaker cables running to a full blown stereo system with an amp or just a simple 3.5 mm phono cable leading to an iPod).

Bluetooth speakers and microphone eschew this physical-cable limitation by relying on the same Bluetooth protocol and audio system that underlies Bluetooth wireless cellphone earpieces and in-car Bluetooth speakerphone systems.

That’s the most elementary and primary component of any Bluetooth speaker on the market. Beyond that there are dozens of big and small variables that distinguish (or fail to distinguish) different Bluetooth speaker makes and models from one another.

Bluetooth speakers are different from Wi-Fi based audio solutions, like the whole-house Sonos system, in several key ways. First, Bluetooth solutions are typically meant to be highly portable whereas whole-house solutions are usually installed permanently or semi-permanently in fixed locations.

Second, Bluetooth speakers and microphone link directly to their source (usually a phone or tablet) and require no intermediary whereas whole-house solutions require the Wi-Fi network to bridge the source and the devices. This also allows whole-house networks to broadcast the same music stream to multiple and distance speakers, however, a feature impractical for Bluetooth speakers that have a roughly 30 foot range.

Finally audio quality is slightly higher on Bluetooth systems than on Wi-Fi systems (all other variables the same) simply because of the nature of the transmission; practically speaking this is a non-consideration; however, as under casual listening conditions the difference would be indiscernible to most.

1.2                                             OBJECTIVE OF THE PROJECT

Bluetooth technology, created in the late 1990s, is widely used to establish a short-range wireless connection between two handheld mobile devices. A Bluetooth setup also makes it possible to transfer a stereo audio signal from a handheld device to a wireless headset. The objective of this work is to design a system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection and a music player through a Bluetooth module.

1.3                                         SIGNIFICANCE OF THE PROJECT

This system is a convenient way listen to music away from your computer, home stereo system, or car and you want to listen to music that is digitized (be it via streaming or files stored on your phone or tablet) then a Bluetooth speaker is pretty much exactly what you’re looking for: a portable speaker that links wirelessly to your phone.

Bluetooth speakers and microphone are great when you want to take music to the beach, out on the back deck beyond the reach of your traditional stereo, or anywhere else you’d traditionally take a portable stereo.

Bluetooth powered home audio solutions that are meant to replace traditional stereo systems, bookshelf speakers, and other audio fixtures. The focus of this buying guide is on portable units that you can easily move around your house, take out to the yard, and beyond.

1.4                                           LIMITATION OF THE PROJECT

Bluetooth speakers have exploded in popularity, and are the easiest way to play music off your smartphone. The problem is the speakers are usually a bit small and the sound doesn’t quite fill a room.

A bluetooth amplifier board connects the speakers and a 24-volt power supply is needed to drive everything. You’ll need a soldering iron and screwdriver to finish the connections.

1.5                                                 SCOPE OF THE PROJECT

Wireless Bluetooth stereo audio system—one that’s also fairly low-cost—for outdoor use. The system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection and a music player or with an Apple iPod model. This system has:

• 1,000 mAh Rechargeable Li-ion Battery (9hrs Playback)
• Dual 3W (4ohms) 35mm Neodymium Drivers
• High Efficiency 2x3W Amplifier (0.1%THD)
• 15 meter Standard Bluetooth Range
• 5mm Auxiliary Ready
• Mini USB Charge Plug

1.6                           APPLICATION OF THE PROJECT

• Various types of high-quality Bluetooth stereo headphones.
• Various types of high-quality Bluetooth stereo speakers, stereo.
• All kinds of high-quality wireless Bluetooth stereo audio receiver equipment.