Design And Construction Of Sound Activated Switch

ABSTRACT

This project is titled design and construction of sound activated switch. Sound activated switch is an electrical device that allows appliances and products to be turned on and off from sound. The most important feature of the sound activated switch is its small microphone. The microphone detects sound, such as laughs, slamming doors, and claps of hands. The sound is changed into electrical waves. The electrical waves are magnified by a transistor. The transistor feeds the amplified sound to a flip-flop circuit. The flip-flop reverses the output and feeds another amplified circuit. The amplified circuit is connected to a relay contact which acts as a mechanical switch. The relay can be connected to an electric device to make the device turn on and off by the clap of hands or a similar sound.

TABLE OF CONTENTS

Title Page

Approval Page

Dedication

Acknowledgement

Abstract

Table of Content

CHAPTER ONE

1.0     Introduction

1.1     Application of sound activated switch

1.2     Objective of the study

1.3     Significance of the study

CHAPTER TWO

2.0     Literature review

2.1     Review of Major Component used

CHAPTER THREE

3.0     Construction

3.1      System operation

3.2     Circuit diagram

3.3     Parts list

3.4     Circuit operation

CHAPTER FOUR  

Result analysis

4.0     Construction Procedure and Testing

4.1     Casing and Packaging

4.2     Assembling of Sections

4.3     Testing of System Operation

4.4      Cost Analysis

CHAPTER FIVE

5.0     Conclusion

5.1     Recommendation

5.2     References

CHAPTER ONE

1.0                                        INTRODUCTION

With this sound activated switch, control by sound may be very useful, not just on a robot but also for a bit of home automation, for example a sound-activated light responding to a knock on the door or a hand clap. The light will be automatically switched off when the sound is repeated.

Sound activated switch is an electrical device that allows appliances and products to be turned on and off from sound. The most important feature of the sound activated switch is its small microphone. The microphone detects sound, such as laughs, slamming doors, and claps of hands. The sound is changed into electrical waves. The electrical waves are magnified by a transistor. The transistor feeds the amplified sound to a flip-flop circuit. The flip-flop reverses the output and feeds another amplified circuit. The amplified circuit is connected to a relay contact which acts as a mechanical switch. The relay can be connected to an electric device to make the device turn on and off by the clap of hands or a similar sound.

• APPLICATION OF SOUND ACTIVATED SWITCH

Sound activated switch has many applications both in homes and industries. In homes, sound activated switch is as used to control a lamp in our rooms and environs.

In industries, sound activated switch is used to control an alarm and time of danger when the security of any place in industries is needed, and also used to monitor intruders in any given environment by activating an alarm when the noise of the intruder gets to the microphone of the system. It can be used to switch on/off any electrical appliances

• OBJECTIVE OF THE STUDY

The objective of this project is to design and construct a sound activating switch that can be used to control either a lamp or an alarm or any other load.

Want to build a simple sound switch circuit that will toggle any load in response to your claps. The article is meant exactly for the said purpose. A small sound activated switch circuit comprising a sound amplifier and a flip flop is presented here, which can be easily built and used to toggle any electrical gadget through hand claps.

1.3        SIGNIFICANCE OF STUDY

This study exposes me to the function of a microphone such as that microphone converts the pressure waves caused by sound into vibrations within a coil which transforms the vibrations into electric signals.

This work also exposed me to application of transistor such as using transistor as a switch and also application of a relay such as relay is also used as a switch as well to control load.

Finally, this work mostly exposed me to how to construct this system and also exposed me to know the applications of the system such as: homes, sound activated switch is as used to control a lamp in our rooms and environs.

In industries, sound activated switch is used to control an alarm and time of danger when the security of any place in industries is needed, and also used to monitor intruders in any given environment by activating an alarm when the noise of the intruder gets to the microphone of the system.