Construction Of Power Outage Alarm

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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



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(2016, 01). Construction Of Power Outage Alarm.. ProjectStoc.com. Retrieved 01, 2016, from https://projectstoc.com/read/7049/construction-of-power-outage-alarm-7895
"Construction Of Power Outage Alarm." ProjectStoc.com. 01 2016. 2016. 01 2016 <https://projectstoc.com/read/7049/construction-of-power-outage-alarm-7895>.
"Construction Of Power Outage Alarm.." ProjectStoc.com. ProjectStoc.com, 01 2016. Web. 01 2016. <https://projectstoc.com/read/7049/construction-of-power-outage-alarm-7895>.
"Construction Of Power Outage Alarm.." ProjectStoc.com. 01, 2016. Accessed 01, 2016. https://projectstoc.com/read/7049/construction-of-power-outage-alarm-7895.

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