DESIGN AND CONSTRUCTION OF A LOW VOLTAGE (± 15 VOLTS) POWER SUPPLY UNIT

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DESIGN AND CONSTRUCTION OF A LOW VOLTAGE (± 15 VOLTS) POWER SUPPLY UNIT

TABLE OF CONTENTS

CHAPTER ONE

  1. Introduction                                                                            1

1.1     Background of the Study (Aim/Objective)                               1

  1. Statement of Problem                                                              2

 

CHAPTER TWO

  1. Literature Review                                                                              3

2.1     The Working Principle of a Transformer  3 

  1. Components of a Transformer                                                          6
  2. Types of Transformers                                                            6
  3. Rectifier Circuit                                                                       7
  4. Types of Diodes                                                                      8
  5. Analysis of the Components and their Functions                             9
  6. Rectifier Diode                                                                        13
  7. Regulator Stage (Circuit)                                                         16
  8. Filter Circuit                                                                            17

CHAPTER THREE

3.0Construction and Design of a Low                                                     20

Voltage 15v d.c Power Supply Unit

3.1       Circuit Diagram of the Unit                                                                20

3.2Mode of Construction                                                                          20

3.3Specifications                                                                                      21

 

CHAPTER FOUR

4.0Testing Result, Conclusion and                                                                       23

Recommendations

4.1       Precautions Taken During Construction                                            24

4.2Troubleshooting                                                                                              24

4.3References                                                                                                       26

 

 

CHAPTER ONE

  1. INTRODUCTION

A low voltage power supply unit is basically al unit that can supply a (variable) d.c voltage output according to the designer(s) specifications. In this case the d.c voltage output is 15v (full wave rectification). (The condition of a (variable) d.c power unit distinguishes it from the power supplied by the National Electric) power Authority (NEPA) or the likes.

BACKGROUNDOF THE STUDY (AIM/OBJECTIVE)

a low voltage power supply unit is designed generally for use in portable electrical and for electronic appliances, namely, portable radio, prano, charging of batteries used in emergency lights and also orders, and for changing of hand sits batteries its importance in battery changing is more obvious due to the frequent NEPA cut.

 

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DESIGN AND CONSTRUCTION OF A LOW VOLTAGE (± 15 VOLTS) POWER SUPPLY UNIT

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