The aim of this work is to design an ac variable power supply of 0 - 50VAC. This work makes it possible for someone that wants to run different appliance of higher or lower voltage rating without considering buying a new power supply.  A variable power supply is an electronic device that supplies different level of electric energy to an electrical load. The primary function of a variable power supply is to supply different electrical energy to loads that fall at the same rating limit.

 

 

 

CHAPTER ONE
1.1                                                        INTRODUCTION
A power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads.
Every power supply must obtain the energy it supplies to its load, as well as any energy it consumes while performing that task, from an energy source. Depending on its design, a power supply may obtain energy from various types of energy sources, including electrical energy transmission systems, energy storage devices such as a batteries and fuel cells, electromechanical systems such as generators and alternators, solar power converters, or another power supply.
All power supplies have a power input, which receives energy from the energy source, and a power output that delivers energy to the load. In most power supplies the power input and output consist of electrical connectors or hardwired circuit connections, though some power supplies employ wireless energy transfer in lieu of galvanic connections for the power input or output. Some power supplies have other types of inputs and outputs as well, for functions such as external monitoring and control.
This power supply focuses on ac variable power supply. A variable power supply is one which includes some means for the user to easily adjust the output voltage and sometimes the current. Adjustment is most often accomplished with a potentiometer. This device takes ac as the input voltage to give a variable ac output, that is, from 0vac – 50vac.

1.2                                                   AIM OF THE PROJECT
The aim of any power supply is to provide the required voltage to the load using an AC supply at the input and also at the output. This device is designed to power device with variable ac output voltage of 0 to 50vac, and the output is gotten by turning the voltage adjuster known as the potentiometer.

1.3                                           LIMITATION OF THE PROJECT
This device is limited at producing 0 – 50 v output using a potentiometer, rectifying diode and TLC277 precision dual operational amplifier as the major components used.

1.4                                         SIGNIFICANCE OF THE PROJECT
This work makes it possible for someone to use one power supply to run different devices of higher or lower voltage rating without considering buying a new or different power supply.

1.5                                          APPLICATION OF THE PROJECT
A variable power supply is a regulator that electricians and electrical project hobbyists use to test the capacity of voltage for any project they may have completed. The power supply is used as a gauge to make sure the piece of work the person has completed is able to withstand certain amounts of voltage and current load. Tests are generally conducted by applying different amounts of voltage to the piece of completed work a little at a time to ensure the stability of the circuit the individual has created. These types of power supplies also are used by hobbyists to power small electronics requiring variable voltage and by tattoo artists to power tattooing guns.
By using such a variable supply of power, the individual is able to spot any temperaments or inconsistencies in the circuit he’s created in a manner that allows for adjustment to be made without having to scrap the entire project. A variable power supply is a useful tool for anyone who has a background with electrical circuitry and components. It also has many uses other than just testing.
In addition to being used to test circuits, this type of power supply may be used by miniature hobbyists as well. For example, such tools are commonly used by those who work with miniature electronic train sets. The power supply can be adjusted to either speed up or slow down the train as it is pushed around the track by the power of the completed circuit.

1.6                                                 SCOPE OF THE PROJECT
This is AC variable power supply circuit that apply output of 0-30V at 3A by use electronic components are bridge diode as main and control voltage by potentiometer easily. The output AC voltage can be adjusted by increasing or reducing resistance between bride diode.

1.7                          PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to this study. In this chapter, the background, significance, objective limitation and problem of this study were discussed.
Chapter two is on literature review of this study. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

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