Figure 1.1 circuit diagram of a 25W Audio Power Amplifier

Figure 2.1 Resistor colour band table

Figure 2.2a Colour code marking on a resistor

Figure 2.2b Circuit symbol of resisitor

Figure 2.3 Circuit symbols of capacitor

Figure 2.4 Diode circuit symbol

Figure 2.5a Formation of potential barrier

Figure 2.5b Forward biasing a P-N junction diode

Figure 2.5c Reverse biasing a P-N junction diode

Figure 2.6a Structure and symbol of p-n-p and n-p-n transistor

Figure 2.6b Biasing of a transistor

Figure 2.7   Structure of an IC

Figure 2.8 JRC 4558IC circuit diagram

Figure 3.1a The power supply circuit diagram

Figure 3.1b Block diagram of a power supply unit

Figure 3.2a The Pre-amplifier circuit diagram

Figure 3.2b The OP-amp audio mixer

Figure 3.3 The tone control circuit

Figure 3.4a A complementary symmetry class B amplifier

Figure 3.4b The output stage of the public address system

Figure 4.1 The circuit layout diagram

Figure 4.2 The body construction diagram (case)

Figure 4.6 Costing table.

TABLE OF CONTENTS

Title page

Dedication

Acknowledgement

Approval page

Abstract

List of tables, graph and figures

Table of contents

Chapter ONE

1.1 Introduction

Chapter TWO

2.1 Resistors

2.2 Capacitors

2.3 Diodes

2.4 Bipolar Junction Transistor (BJT)

2.5 Integrated Circuits (ICs)

Chapter THREE

3.1 Power supply

3.2 Pre-amplifier

3.3 Tone control

3.4 Power amplifier

Chapter FOUR

4.1 Breadboard/Prototyping

4.2 Circuit layout

4.3 Construction

4.4 Testing and Result

4.5 Packaging

4.6 Costing

Chapter FIVE

References