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DESIGN
AND CONSTRUCTION OF SOUND DETECTOR WITH ALARM SYSTEM
ABSTRACT
This project is design and construction of a sound detector with alarm system
was done primarily to detector sound. It can be use in industrial and
domestics. It employ four discreet stages with power supply which power the
system.
The 1st block is pick up amplifier containing the microphone and the
input which serve as a transformer which the function is to pick up the
smallest sound that comes close to the amplifier
The second block is comparator with hysterias. The function as analogue to
digital convector and also it help to accumulate amparm sound like sound of the
gun short or any other heavy sound
Block three. This is transistor switching this stage consist three bipolar
function transistor (BJI) with a decay circuit found using capacitor time
constant (T – RC) with a 12v Re let, it output work function is to switch the
alarm circuit.
Block four. This is the Alarm circuit, it’s function is the alarm tone. It is
an stable mutivibertor that produce 1kH2 tone frequencies which sound as alarm
signal with loud speaker which serves as an output transformer.
TABLE OF CONTENT
CHAPTER
ONE
INTRODUCTION
1.1
General description of project
1.2
Design objectives
1.3
Significance of the project
1.4
The report layout
CHAPTER
TOW
LITERATURE
REVIEW
2.1
Historical background of the project
2.2
Theories and models relevant to the
design
2.3
List and description of the system
component
2.4
Distinction between the existing method
of design and the new approach.
CHAPTER
THREE
SYSTEM
DESIGN
3.1
Description of the system building
blocks
3.2
System design specification
3.3
Block diagram of the system
3.4
Description of the overall operation of
the system
3.5
Component list
3.6
Complete circuit diagram of sound
detector with alarm system.
CHAPTER
FOUR
Implementation
testing and results
CHAPTER
FIVE
Cost analysis
conclusion and recommendation
REFERENCE.
CHAPTER
ONE
INTRODUCTION
1.1
THE GENERAL DESCRIPTION OF PROJECT
Due to advance electron logy in the electronic which gave rise to automation of
electronic system in domestic and industrial use. This development is what gave
me the courage to choose a project topic on sound detector with alarm system.
This system employ four discreet stages with power supply namely, the pick up
microphone, Amplifier, Schmih trigger, thysistor switch circuit with rally
circuit and 1kHz turn generator which from the alarm circuit at the input of
the system a transducer which a capacitor microphone whose the function is to
piece the sound and it out put to feed in to class. A amplifier microphone
preamplifier of two transistor stage cable of amplifier the sound to a standard
were it be accepted by the schmih trigger or built using comparator with
hysterics. This comparator with hysterics is acting as amuroge to digital
convector (AID) whose one put switching between high or low conditionally. An
interface containing a transistor switching circuit with rally at it out put
such that once a sound is pick up out the input the rally is energized capable
of switching an alarm circuit on.
1.2
OBJECTIVE DESIGN
The main objective
design of the project is to design and construct an electronically operated
system capable of picking sound of a visitor at the door processing the alarm
put natural sound wave to an out put electrical sound signal to alarm signal to
alert the people inside the house that some body is at the door outside,
also it help increasing the standard exposure in the practical aspect of
engineering training.
1.3
SIGNIFICANCE OF THE STUDY
The project designed work on sound detector with alarm quite, applicable in
almost every where like industries and for domestic use for instance it could
serve as audio activated door bell for office installation also used to monitor
an intruder in our domestic places.
1.4
THE REPORT LAYOUT
For clarity and simplicity, the report is divided into five chapters. The
chapter one deals on the introduction, which centers on general description of
project, design objectives, significance of the project and the report layout.
The next chapter which is chapter two is on the literature review which talks
on the historical background of sound detector with alarm system theories and
models relevant to the design, list and description of the system component and
lastly distinction between the existing method of design and the new approach.
Chapter three is on system design and which is all about the description of the
system building blocks, system design specification, block diagram of the
system, description of the overall operation of the system. Component list and
complete circuit diagram of a sound detector with alarm system. Chapter four is
on implementation, testing and results. Then chapter five is one cost analysis
conclusion and recommendation.
As maximum measure of comprehensibility was ensured throughout the report. This
is indicated by the pattern of presentation and consistent system of rotation.
This I believe will ensure maximum reader satisfaction.
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