A step-by-step approach to the construction of a type of transistionized power regulator of known output voltage. A power regulator is described in the course of this project. The zener diode reverse voltage breakdown is used to the advantage to produce a power regulator diode. That is to say, it is possible to use a zener diode to produce a relative constant voltage from a supply voltage, which can itself fluctuate considerably. This kind of diode belongs to a class of material called “semi-conductor” device, which have intermediate values of resistivities between conductors and insulator. These devices have an important property of conducting current in two independent way i.e. by negative charged (free electrons) and positive charge (holes) and that effectively controlled. In a power regulator circuit, zener diode functions as a voltage-regulating device, when connected across a voltage supply source to a load. It maintains constant potential difference across the load despite the fluctuation in the value of the load resistance or of the voltage from the supply source.

TABLE OF CONTENT

Title Page

Certification

Dedication

Acknowledgement

Abstract

Table of Content

CHAPTER ONE

1.0 Introduction

1.1 Statement of problem

1.2 Aim and objectives of the study

1.3 Justification of study

1.4 Limitation of study

CHAPTER TWO

2.0 Literature review (background information of study)

2.1 Units of power supply regulator

2.2 Transformer

2.3 Rectifier

2.4 Smoothing

2.5 Zener diode

CHAPTER THREE

3.0 Design of a stabilized power regulator

3.1 Circuit diagram

CHAPTER FOUR

4.0 Power regulator and zener characteristic

CHAPTER FIVE

5.0 Construction and testing of a power regulator

5.1 Conclusion

REFERENCE

CHAPTER ONE

INTRODUCTION

1.1 TRANSISTORIZED POWER REGULATOR

According to Vinycomb (1957), a power regulator is an electronic instrument, which is specially designed to give a specific output voltage. In this project, the supply unit involved in this construction is meant to deliver an output voltage of 240 volts and a current of 0.2 amperes, it is designed to give a stable voltage and current which will help in carrying out the process in which the regulator is designed for. Some equipment are delicate air can be damaged by fluctuation of the power being supplied; this gives the knowledge of constructing a power regulator using a transistor and other electrical components.

Hence, the transistorized power regulator will stabilize the output of (AC) irrespective of the load output supply. Series of devices are connected in the output supply, to deep the voltage constant regardless of variation in the load current.

The basic action of a power regulator is its ability to automatically resist the change in current, in order to maintain a constant voltage.

1.2 STATEMENT OF PROBLEM

Power fluctuation and power leakage, interruption of power supply can cause series of problems in our devices, this destroys and renders the electrical appliances useless.

1.3 AIM AND OBJECTIVES OF THE STUDY

This project is aimed at the economic construction of a simple circuit device that will deliver a specific voltage and current, even if there is power disturbance, the device will have the ability to adjust to maintain the required output.

1.3 JUSTIFICATION OF STUDY

The motive of the seminar is centered on the fact that it is a theoretical realization of the work. This is achieved by using some electronic instrument which can be seen everywhere in out environment and market.