Design And Construction Of A Wireless Amplifier With Jack And Three Wireless Speakers Using Bluetooth Technology

ABSTRACT

This work is on wireless amplifier with jack and three wireless speakers using bluetooth technology. This device provides the easiest way to play music off your smartphone to a amplifier and 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. This device makes it possible to transfer a stereo audio signal from a handheld device to a speaker unit.

CHAPTER ONE

1.1                                                        INTRODUCTION

An audio power amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 – 200k Hz, the human range of hearing) to a level suitable for driving loudspeakers. It is the final electronic stage in a typical audio playback chain.

Power Amplifier delivers power to the load, and as we know from the above, is the product of the voltage and current applied to the load with the output signal power being greater than the input signal power. In other words, a power amplifier amplifies the power of the input signal which is why these types of amplifier circuits are used in audio amplifier output stages to drive loudspeakers.

The power amplifier works on the basic principle of converting the DC power drawn from the power supply into an AC voltage signal delivered to the load. Although the amplification is high the efficiency of the conversion from the DC power supply input to the AC voltage signal output is usually poor.

In this work, we are focusing on a Bluetooth amplifier and speaker. Under normal circumstances, audio amplifier and speakers need a cable linking them to an audio source. Bluetooth amplifier and speakers eschew this physical-cable limitation by relying on the same Bluetooth protocol and audio system that underlies Bluetooth technologies.

This Bluetooth technology can be used in this work to establish a short-range wireless connection between two handheld mobile devices such cellphone to an audio amplifier and its speakers. A Bluetooth setup also makes it possible to transfer a stereo audio signal from a handheld device to a wireless amplifier and bluetooth. it operates 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.

1.1                                                   AIM OF THE PROJECT

The main aim of this work is design an amplifier with speaker that will wirelessly connect with audio source using Bluetooth technology.

1.2                                             OBJECTIVE OF THE PROJECT

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 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

1. The problem is the speakers are usually a bit small and the sound doesn’t quite fill a room.
2. A bluetooth amplifier board connects the speakers and a 24-volt power supply is needed to drive everything.

iii. This work is made for three speaker unit and jack plug – for microphone.

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 an amplifier with Bluetooth module. 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)
• 10 meter Standard Bluetooth Range
• 5mm Auxiliary Ready
• Mini USB Charge Plug
  • APPLICATION OF THE PROJECT

1. Various types of high-quality Bluetooth stereo headphones.
2. Various types of high-quality Bluetooth stereo speakers, stereo.
3. All kinds of high-quality wireless Bluetooth stereo audio receiver equipment.
4. DJ sound system.

1.7                                BENEFIT OF THE PROJECT

Bluetooth speakers link directly to their source (usually a phone or tablet). 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.

The audio quality is slightly higher on Bluetooth systems than on Wi-Fi systems 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.