<p> </p><p>TABLE OF CONTENT</p><p>Title Page ...…………………………………………………………………….i</p><p>Certification…………………………………………………………………….ii</p><p>Dedication ……………………………………………………………………...iii</p><p>Acknowledgement …………………………………………………………….. iv</p><p>Abstract ………………………………………………………………………….v</p><p>Table of content ………………………………………………………………...vi</p><p>List of Symbols ………………………………………………………………. vii </p><p>&nbsp; &nbsp;

Chapter ONE

: Introduction &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1.1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Background of study…………………………………………………… 1</p><p>1.2 &nbsp; &nbsp; Aims and objectives…………………………………………………… &nbsp;3</p><p>&nbsp; &nbsp;

Chapter TWO

: Literature Review……………………………………….4</p><p>&nbsp; &nbsp;

Chapter THREE

: Specification and operation of system component &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3.1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Description of NE55 Timer…………………………………………….12 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</p><p>3.2 &nbsp; &nbsp; Description of Resistor………………………………………………. &nbsp; 14</p><p>3.3 &nbsp; &nbsp; Description of Capacitor…………………………………………….. &nbsp; 16</p><p>3.4 &nbsp; &nbsp; Description of Diode………………………………………………… &nbsp; 27</p><p>3.5 &nbsp; &nbsp; Description of Transformer …………………………………………… 32</p><p>3.6 &nbsp; &nbsp; Description of Loud Speaker and Buzzer……………………………… 41</p><p>3.7 &nbsp; &nbsp; Description of Transistor………………………………………………. 43</p><p>3. 8 &nbsp; &nbsp; Description of L.E.D………………………………………………….. 47</p><p>&nbsp; &nbsp;

Chapter FOUR

: Operation of system and its circuit and block diagram</p><p>4.1 &nbsp; &nbsp; Operation of circuit ………………………………………………… …55</p><p>4.2 &nbsp; &nbsp; The circuit diagram………………………………………………….. ..57</p><p>4.3 &nbsp; &nbsp;The block diagram………………………………………………………58</p><p>&nbsp; &nbsp;

Chapter FIVE

: Construction, Testing and Packaging</p><p>5.1 &nbsp; &nbsp;Values of components………………………………………………….59</p><p>5.2 &nbsp; &nbsp;Assembly………………………………………………………………60</p><p>5.3 &nbsp; &nbsp;A schematic diagram of the finished work…………………………….63</p><p>&nbsp; &nbsp; CHAPTER SIX: Conclusion and Recommendation</p><p>6.1 &nbsp; &nbsp; Conclusion ………………………………………………………….. .64</p><p>6.2 &nbsp; &nbsp; Recommendation …………………………………. …. ……… .….65</p><p>6.3 &nbsp; &nbsp; Observations ………………………………………………………..66</p><p>6.4 &nbsp; &nbsp; Dificulties…………………………………………………….. …57</p><p>6.5 &nbsp; &nbsp; &nbsp;References…………………………………………………. …………68 &nbsp; &nbsp; </p> <br><p></p>