Design And Construction Of A Musical Alarm Timer
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ABSTRACT
A timer is a specialized type of clock for measuring time intervals. Here we present a simple musical alarm timer that can be used for that purpose. This low cost musical alarm timer can be used for introducing a delay of one minute to two hours. After the timing period is over, a musical song is heard. The circuit is built around popular CMOS oscillator/divider CD4060 (IC1). It works off a 9V PP3 battery and its standby current drain is very low.
TABLE OF CONTENTS
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWLEDGEMENT
ABSTRACT
TABLE OF CONTENT
CHAPTER ONE
1.0Â Â Â Â Â INTRODUCTION
1.1Â Â Â Â Â BACKGROUND OF THE PROJECT
1.2Â Â Â Â Â AIM OF THE PROJECT
1.3Â Â Â Â Â OBJECTIVE OF THE PROJECT
1.4Â Â Â Â Â SIGNIFICANCE OF THE PROJECT
1.5Â Â Â Â Â PURPOSE OF THE PROJECT
1.6Â Â Â Â Â APPLICATION OF THE PROJECT
1.7Â Â Â Â Â ADVANTAGES OF THE PROJECT
1.8Â Â Â Â Â PROBLEM/LIMITATION OF THE PROJECT
1.9Â Â Â Â Â PROJECT ORGANISATION
CHAPTER TWO
2.0Â Â Â Â LITERATURE REVIEW
2.1Â Â Â Â Â REVIEW OF RELATED STUDIES
2.2Â Â Â Â Â REVIEW OF RELATED TERMS
CHAPTER THREE
3.0Â Â Â Â CONSTRUCTION METHODOLOGY
3.1Â Â Â Â Â SYSTEM CIRCUIT DIAGRAM
3.2Â Â Â Â SYSTEM OPERATION
3.3Â Â Â Â Â CIRCUIT DESCRIPTION
3.4Â Â Â Â Â SYSTEM CIRCUIT DIAGRAM
3.5Â Â Â Â Â CIRCUIT OPERATION
3.6Â Â Â Â Â IMPORTANCE AND FUNCTION OF THE MAJOR COMPONENTS USED IN THIS CIRCUIT
CHAPTER FOUR
RESULT ANALYSIS
4.0Â Â Â Â Â CONSTRUCTION PROCEDURE AND TESTING
4.1Â Â Â Â Â CASING AND PACKAGING
4.2Â Â Â Â Â ASSEMBLING OF SECTIONS
4.3Â Â Â Â Â TESTING
4.4.1 PRE-IMPLEMENTATION TESTING
4.4.2Â POST-IMPLEMENTATION TESTING
4.5Â Â Â Â Â RESULT
4.6Â Â Â Â Â COST ANALYSIS
4.7Â Â Â Â Â PROBLEM ENCOUNTERED
CHAPTER FIVE
5.1Â Â Â Â Â CONCLUSION
5.2Â Â Â Â Â RECOMMENDATION
5.3Â Â Â Â Â REFERENCES
Musical alarm timer circuit
The circuit is built around popular CMOS oscillator/divider CD4060 (IC1). It works off a 9V PP3 battery and its standby current drain is very low.
Fig. 1: Pin configuration of melody generator IC UM66
By adjusting preset VR1, the time delay can be adjusted. After time delay is over, output pin 3 of IC1 goes high and npn transistor T1 conducts to provide positive power supply to melody generator IC UM66 (IC2) at its pin 2. Zener diode ZD1 reduces this power supply to 3.3V required for operation of IC2.
The output of IC2 is fed to the loudspeaker (LS1) via driver transistor T1. Preset VR2 is used to control the volume of the loudspeaker.
Fig. 2: Musical alarm timer
The timer gets activated when power is supplied by pressing switch S1. To switch off the alarm, you need to switch off the power supply.
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