Design And Construction Of A Clock Tick-Tock Sound Generator And Led Pendulum

Wooden-case, battery-operated wall clocks with pendulums are available in the market. Some even have chimes. What is missing is the tick-tock sound of old mechanical pendulum clocks. This work is on a tick-tock sound generator. It is built around timer IC 7555 (IC1) wired as an astable multivibrator. Resistor R1, preset VR1 and capacitor C1 generate frequencies that can be varied with the help of preset VR1. At output pin 3 of IC1, a small speaker is connected via capacitor C3 that produces the tick-tock sound.

TABLE OF CONTENTS

COVER PAGE

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWELDGEMENT

ABSTRACT

CHAPTER ONE

1.0      INTRODUCTION

1.1      BACKGROUND OF THE PROJECT

• PURPOSE OF THE PROJECT
• AIM OF THE PROJECT
• OBJECTIVE OF THE PROJECT
• PURPOSE OF THE PROJECT
• LIMITATION OF THE PROJECT
• ADVANTAGES OF THE PROJECT
• PROBLEM OF THE PROJECT
• APPLICATION OF THE PROJECT
• RESEARCH QUESTION
• PROJECT ORGANISATION

CHAPTER TWO

LITERATURE REVIEW

• OVERVIEW OF THE STUDY
• REVIEW OF THE RELATED STUDY

CHAPTER THREE

3.0     CONSTRUCTION METHODOLOGY

3.1      BASIC OF THE SYSTEM

3.2     BLOCK DIAGRAM OF THE SYSTEM

3.3      SYSTEM OPERATION

3.4      CIRCUIT DIAGRAM

3.5      CIRCUIT DESCRIPTION

3.6     DESCRIPTION OF COMPONENTS USED

3.7      POWER SUPPLY UNIT

CHAPTER FOUR

4.0      TESTING AND RESULTS

• CONSTRUCTION PROCEDURE AND TESTING
• INSTALLATION OF THE COMPLET DESIGN
• ASSEMBLING OF SECTIONS
• TESTING OF SYSTEM OPERATION
• COST ANALYSIS

CHAPTER FIVE

• CONCLUSION
• RECOMMENDATION
• REFERENCES

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Tick-tock sound generator circuit

Circuit of tick-tock sound generator Wooden clock design

Shown above is the circuit of a tick-tock sound generator. It is built around timer IC 7555 (IC1) wired as an astable multivibrator. Resistor R1, preset VR1 and capacitor C1 generate frequencies that can be varied with the help of preset VR1. At output pin 3 of IC1, a small speaker is connected via capacitor C3 that produces the tick-tock sound. At pin 3 of IC1, two yellow LEDs are also connected on the clock face to flash in time with sound (see Fig. 2). Adjust preset VR1 such that ticking sound closely resembles the tick-tock of old pendulum clocks. Yellow LEDs (LED1 and LED2) match well with the wooden clock.

LED pendulum circuit

Shown below is the circuit for the LED pendulum. It uses another timer 7555 wired in astable mode and its clock pulse at pin 3 is fed to clock pin 14 of decade counter 4017 (IC3). The outputs of IC3 are connected with the help of switching diode 1N4148 such that the six LEDs (LED3 through LED8) flash in sequence in one direction first and then in reverse sequence. The speed of flashing of LEDs can be adjusted with the help of 10-kilo-ohm preset VR2. Capacitor C6 (6.8nF) and resistor R11 (100-kilo-ohm) are used to reset the decade counter.

Circuit for LED pendulum

Construction & testing

Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. Mount the LEDs either in ‘V’ shape or ‘U’ shape on the front panel of the cabinet (as shown in Fig. 4).