ABSTRACT   The topic of this project is " Audio Amplifier". The research embarked upon this study or project by using both primary and secondary source of data. The main instrument used for data collection are: Modern electronics circuit Design. By David J. Commer. Electronics Devices. By Floyd Electrical Installation Theory and Practice. By Dennelly E.L. Electronics IV. By Dr. Green Electronics II. By Ejinofor C.O. Radio and Transmission "A". BY D.C. Green Electronics e Fault Diagnosis. By Loveday. The research discovered that this fays people normally have to address large gatherings data time and an efficient means of communication has to be used, if not, the message can not be heard by people at long range. The researcher recommended that use of amplifier should be made effective so that people can address large gathering at a time so that were ever you are you will be communicated.   TABLE OF CONTENT Title page certification Certification Acknowledgement Abstract Table of content CHAPTER ONE: Introduction Preamble 1.2 Definition of terms .A. CHAPTER TWO: Description of components 2.1 power transformer 2.2 Resister 2.3 Capacitor 2.4 Integrated circuit 2.5 Semi conductor diodes 2.6 Transistors CHAPTER THREE: Power supply 3.1 Circuit diagram 3.2 Operation of transformer 3.3 Rectification and smoothening CHAPTER FOUR: Power amplifier 4.1 Power amplifier circuit 4.2 Biasing and stabilization CHAPTER FIVE:  Coupling of circuit stage 5.1 The overall circuit diagram 5.2 Tone circuit 5.3 Coupling method CHAPTER SIX: Casing and packaging 6.1 Casing and packaging materials 6.2 Back connection 6.3 Conclusion 

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