ABSTRACT This work is a power supply monitoring device that triggers a buzzer when the mains supply cuts off. Thus a diode (bridge rectifier diode) was used to convert the AC voltage to DC voltage and the 240v/12v AC mains power transfer was used with a bridge rectifier for rectification and a 470Nf filter capacitor C1 for the smoothing of the voltage. A transformer for stepping down the 240volts was also used before it was rectified. Resistor R1 for reduction of the voltage to power the LED (light emitting diode) was connected between C1 and the ground to indicate when power was off together with the buzzer. This operates in such a way that when there was no mains power available the relay was switched unto its normally closed terminals. At this instance the um66 musical melody IC was energized to produce a continuous stream of tones and this available low audio musical tone was amplified using the 2N3904 transistor such that a much louder audio sound was available at the collector output of the 2N3904 with the aid of the loudspeaker thereby producing a power outage.
Table of contents
Title page i Certification ii Dedication iii Acknowledgement iv Table of contents v Abstract viii CHAPTER ONE 1.0 Introduction 1 1.1 Background of the study 1 1.2 Statement of the problem 2 1.3 Objective of the study 3 1.4 Significance of the study 3 1.5 Scope f the study 3 CHAPTER TWO 2.0 LITERATURE REVIEW 4 2.1 Description 7 2.2 Transformer 7 2.3 Capacitor 9 2.4 Transistor 10 2.5 Diodes 12 2.6 Electromagnet relay (LED) 13 2.7 Contact 14 2.8 Resistor 15 2.9 Battery 16 2.10 Loud speaker 17 2.11 Bridge rectifier 18 2.12 Integrated circuit um66 18 CHAPTER THREE 3.0 Material and method 20 3.1 AC Input 20 3.2 Power supply circuit 20 3.3 The switch circuit 22 3.4 Back of battery circuit 22 3.5 Alarm circuit 23 3.6 Loud speaker 23 3.7 The circuit diagram 24 3.8 Construction 24 3.9 The casing construction 25 3.10 Tools used for the construction 26 CHAPTER FOUR 4.0 Test and result 27 4.1 Result 28 CHAPTER FIVE 5.0 discussion 29 5.1 Problem encountered 29 5.2 Solution 29 5.3 Recommendation 30 5.4 Conclusion 31 References 32
ABSTRACT This work analysed the current state of power system in Nigeria with emphasis on distribution system using Akwa Ibom Distribution System as a case study. The components of the study system were analyzed. This work adopted the analytical and simulation approach to reliability and stability assessment. Analysing the system the way it is... Continue Reading
ABSTRACT This work analysed the current state of power system in Nigeria with emphasis on distribution system using Akwa Ibom Distribution System as a case study. The components of the study system were analyzed. This work adopted the analytical and simulation approach to reliability and stability assessment. Analysing the system the way it is... Continue Reading
ABSTRACT This research work examines the factors affecting power outage in Nigeria. Constants Power supply is the hallmark of a develop economy. Any nation whose energy need is epileptic in supply. Prolongs her development and risk-losing potential investors. Nigeria with population of over 12 million people has for the... Continue Reading
ABSTRACT This research work examines the factors affecting power outage in Nigeria. Constants Power supply is the hallmark of a develop economy. Any nation whose energy need is epileptic in supply prolongs her development and risk-losing potential investors. Nigeria with population of over 120 million... Continue Reading
ABSTRACT This research work examines the factors affecting power outage in Nigeria. Constants Power supply is the hallmark of a develop economy. Any nation whose energy need is epileptic in supply prolongs her development and risk-losing potential investors. Nigeria with population of over 120 million people has for the past 40 years of... Continue Reading
ABSTRACT This research work examines the factors affecting power outage in Nigeria. Constants Power supply is the hallmark of a develop economy. Any nation whose energy need is epileptic in supply prolongs her development and risk-losing potential investors. Nigeria with population of over 120 million... Continue Reading
CHAPTER ONE INTRODUCTION 1.1 BACKGROUND OF THE STUDY Electricity is a significant component of virtually any production process. As such, limited supply has the potential to, directly and/or indirectly, affect the economic activities of firms. In documenting such a crucial economic role of energy, a common approach in the... Continue Reading
Chapter One 1. Introduction World Bank (1991:31) defined development as “a sustainable increase in living standard that encompasses material consumption, education, health and environmental protection”. Social scientists, particularly economists and sociologists, have for centuries been preoccupied with the subject matter of development. The... Continue Reading
CHAPTER ONE INTRODUCTION 1.1 Background of the study Nigeria is hugely endowed with energy resources that include oil, natural gas, coal, biomass, solar, wind and hydro resources among others (Iwayemi, 2008; Onuaha, 2010). However despite this huge endowment Nigeria is also an energy deficient country whose economy suffers tremendously... Continue Reading
ABSTRACT The main objective of this project was to ensure a proper security to car being parked in garage against theft or an intruder. The circuit uses three NE555 timers; one of the NE555 was wired as a monostable oscillator and remaining two were wired as tone generator and amplified to obtain a maximum audible sound. However, pin 2 of the... Continue Reading