Wireless the speaker is a type of speaker that transmits audio signals using radio frequency (RF) waves rather than over audio cables. As things stand today, the term ‘wireless’ in the audio and video world does not mean wireless rather all it means is fewer wires. A common complaint against home audio systems has been the cables that interconnect the speakers to the audio receiver, tuner, CD player, or stereo units. As more and more channels are added to modern audio equipment, the problem of connecting the speakers to the audio sources is getting worst.

In this project, a wireless loudspeaker that will transmit using radio frequency (RF) is designed and constructed. The receiver and the transmitter circuits were implemented to achieve the aim of this project.

The the method used involves the design of the receiver and the transmitter circuits as well as the amplifier and the nature of the mixer. The transmitter was designed to use a 9V battery which can easily be replaced. The radius of reception is within 100meters with a power output of 0.03MW. The amplifier was designed to produce an output power of 20W to an 8ohms (8 ) loudspeaker. The audio amplifier was powered from the rectified receiver consists of an aerial and a demodulator with the help of a tuned circuit which helps to pick the required signal.

The components were initially mounted on a breadboard and tested; some of the mistakes were corrected before finally transferring it onto the printed circuit board (PCB) for permanent soldering. The whole circuit was successfully tested, and it was observed that the system is functioning in optimal condition. Due to this fact, one can rate the project’s performance at about 87%.

The the constructed wireless loudspeaker system can stand the test of time in its performance. It is very reliable, and the overall performance is excellent. Conclusively the wireless loudspeaker system successfully achieved the aim of transmitting and receiving voice signals over a distance. I learned and researched more on the use of modulation and demodulation, the amplifier circuitry, etc.


Title page                                                                                                                                i

Certification                                                                                                                            ii

Dedication                                                                                                                              iii

Acknowledgment iv

Table of contents                                                                                                                    v

List of figures                                                                                                                         ix

List of tables                                                                                                                           x

List of abbreviations                                                                                                               xi

Abstract                                                                                                                                  xii


1.0        INTRODUCTION                                                                                                        1

1.1 Preambles                                                                                                                          1

1.2 System block diagram                                                                                                       3

1.3 Background study                                                                                                                        5

1.4 Aims and objectives                                                                                                          7

1.5 Problem statement                                                                                                                        7

1.6 Justification                                                                                                                       7

1.7 Scope of study                                                                                                                  9


2.0 LITERATURE REVIEW                                                                                                            10

2.1 Ancient medium of information transmission                                                                  10

2.2 Modern-day medium approach                                                                                         11

2.2.1 Problems associated with the earlier system                                                                  11

2.2.2 Working principles of the modern system                                                                     12

2.3 Wireless transmission system                                                                                            12

2.3.1 Wired transmission system                                                                                            13

2.4 Public transmission system                                                                                               13

2.4.1 The transmitter system                                                                                                   13

2.4.2 The receiver system                                                                                                        15

2.4.3 Antenna                                                                                                                                     15 Channel                                                                                                                       16 Functions of the antenna                                                                                            16

2.4.4 The tone control and the mixing stage                                                                           16

2.4.5 The audio amplifier                                                                                                        17

2.4.6 The loudspeaker                                                                                                             17

2.5 Modulation                                                                                                                       18

2.5.1 Frequency modulation                                                                                                   18


3.0 METHODOLOGY                                                                                                          21

3.1 Power supply unit design                                                                                                  21

3.2 Transmitter design                                                                                                            22

3.3 Amplifier circuit design                                                                                                    24

3.4 Receiver principles                                                                                                            26

3.5 Demodulation                                                                                                                   26

3.6 The input stage                                                                                                                  27

3.7 Transmitter circuitry                                                                                                          27

3.8 Mixing stage                                                                                                                     27

3.9 Audio power amplifier                                                                                                      31


4.0 CONSTRUCTION AND TESTING                                                                               32

4.1 The power supply                                                                                                              32

4.2 The output power amplifier                                                                                              32

4.3 Dissipation of excess heat                                               &



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