Design And Construction Of A Timer From Old Quartz Clock
ABSTRACT
This work is on low-cost timer from the circuit of an old quartz clock. This timer has time duration of up to two hours, which is sufficient for most day-to-day activities.
The quartz clock circuit has two outputs that drive a coil. One of them (which produces a pulse every two seconds) is used to drive counter CD4040, which can count up to 4096. The time duration as per your requirement can be set using DIP switches. Each switch has its own set time duration. The desired time is set with Q5 to Q12 outputs via DIP switches 1 through 8 (refer the table). That is, if you want to set the time duration to 68 minutes, shift switch 8 to ‘on’ position. This will make Q12 high. If two switches are ‘on,’ the time duration set will be equal to the sum of individual time durations. You can set maximum time duration of 136 minutes (which is the sum of the outputs of all the switches) by making all the switches ‘on.’ The outputs of the counter pass through diodes D5 through D12.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.0 INTRODUCTION
1.1 BACKGROUND OF THE PROJECT
1.2 AIM OF THE PROJECT
1.3 OBJECTIVE OF THE PROJECT
1.4 SIGNIFICANCE OF THE PROJECT
1.5 PURPOSE OF THE PROJECT
1.6 APPLICATION OF THE PROJECT
1.7 ADVANTAGES OF THE PROJECT
1.8 PROBLEM/LIMITATION OF THE PROJECT
1.9 PROJECT ORGANISATION
CHAPTER TWO
2.0 LITERATURE REVIEW
2.1 REVIEW OF RELATED STUDIES
2.2 REVIEW OF RELATED TERMS
2.3 REVIEW OF CLOCK AND OLD QUARTZ CLOCK
CHAPTER THREE
3.0 CONSTRUCTION METHODOLOGY
3.1 SYSTEM CIRCUIT DIAGRAM
3.2 SYSTEM OPERATION
3.3 CIRCUIT DESCRIPTION
3.4 SYSTEM CIRCUIT DIAGRAM
3.5 CIRCUIT OPERATION
3.6 IMPORTANCE AND FUNCTION OF THE MAJOR COMPONENTS USED IN THIS CIRCUIT
3.7 POWER SUPPLY UNIT
CHAPTER FOUR
RESULT ANALYSIS
4.0 CONSTRUCTION PROCEDURE AND TESTING
4.1 CASING AND PACKAGING
4.2 ASSEMBLING OF SECTIONS
4.3 TESTING
4.4.1 PRE-IMPLEMENTATION TESTING
4.4.2 POST-IMPLEMENTATION TESTING
4.5 RESULT
4.6 COST ANALYSIS
CHAPTER FIVE
5.0 CONCLUSION
5.1 RECOMMENDATION
5.2 REFERENCES
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