<p> </p><p>Figure 1.1 circuit diagram of a 25W Audio Power Amplifier</p><p>Figure 2.1 Resistor colour band table</p><p>Figure 2.2a Colour code marking on a resistor</p><p>Figure 2.2b Circuit symbol of resisitor</p><p>Figure 2.3 Circuit symbols of capacitor</p><p>Figure 2.4 Diode circuit symbol</p><p>Figure 2.5a Formation of potential barrier</p><p>Figure 2.5b Forward biasing a P-N junction diode</p><p>Figure 2.5c Reverse biasing a P-N junction diode</p><p>Figure 2.6a Structure and symbol of p-n-p and n-p-n transistor</p><p>Figure 2.6b Biasing of a transistor</p><p>Figure 2.7 &nbsp; Structure of an IC </p><p>Figure 2.8 JRC 4558IC circuit diagram</p><p>Figure 3.1a The power supply circuit diagram</p><p>Figure 3.1b Block diagram of a power supply unit</p><p>Figure 3.2a The Pre-amplifier circuit diagram</p><p>Figure 3.2b The OP-amp audio mixer</p><p>Figure 3.3 The tone control circuit</p><p>Figure 3.4a A complementary symmetry class B amplifier</p><p>Figure 3.4b The output stage of the public address system</p><p>Figure 4.1 The circuit layout diagram</p><p>Figure 4.2 The body construction diagram (case)</p><p>Figure 4.6 Costing table.</p><p><b>TABLE OF CONTENTS</b></p><p>Title page</p><p>Dedication</p><p>Acknowledgement</p><p>Approval page</p><p>Abstract</p><p>List of tables, graph and figures</p><p>Table of contents</p> <p><b>

Chapter ONE

</b></p><p>1.1 Introduction</p><p><b>

Chapter TWO

: DESCRIPTION OF CIRCUIT ELEMENT</b></p><p>2.1 Resistors</p><p>2.2 Capacitors</p><p>2.3 Diodes</p><p>2.4 Bipolar Junction Transistor (BJT)</p><p>2.5 Integrated Circuits (ICs)</p><p><b>

Chapter THREE

: PRINCIPLE OF OPERATION</b></p><p>3.1 Power supply</p><p>3.2 Pre-amplifier</p><p>3.3 Tone control</p><p>3.4 Power amplifier</p><p><b>

Chapter FOUR

: CONSTRUCTION AND TESTING</b></p><p>4.1 Breadboard/Prototyping</p><p>4.2 Circuit layout</p><p>4.3 Construction</p><p>4.4 Testing and Result</p><p>4.5 Packaging</p><p>4.6 Costing</p><p><b>

Chapter FIVE

: CONCLUSION/RECOMMENDATION</b></p><p><b>References</b></p> <br><p></p>