ABSTRACT
An intercommunication system is nothing but the communication
between two or more persons not close to one another. This does not mean we
should categorize telephones, fax, teleprinters, telegraphs etc. an example of
intercom system sine they are used in communication between people. Infact,
intercom involves short distance places. It is limited in electronics, offices,
and hospitals.
The intercom system under is a three way station type. This
means that a person can communicate to the other at another station at his own
convenient time. They call once another attention by the use of the tone
generated by the use of tone generator.
Depress a button and the tone sounds, and the same switch is
thrown to the intercom circuit thus they communicate.
This system to be used in solving the problem of poor
communication in our department. Besides, it can be extended to some other offices
by the addition this one may use a rotary switch
TABLE OF CONTENT
Title page
Certification
Dedication
Acknowledgement
Abstract
Table of contents
CHAPTER ONE
1.0
INTRODUCTION
CHAPTER TWO
Complete Circuit Description
2.0 Simplified block
diagram of thee 3-way intercom system
2.1 Operation
Principles
CHAPTER THREE
3.0 ICC1212C
3.1 Resistor
3.2 Capacitor
3.3 Condenser
Microphone
3.4 Loudspeakers
3.5 Switches
3.6 Communication
cables
CHAPTER FOUR
CIRCUITRY DESIGN AND DESCRIPTION
4.0 Description of
Power Supply Unit Circuit
4.1 Description of
the tone Generator Circuit
4.2 Circuit Diagram
of the Three Units and Explanation
4.3 Explanation of
the Switching Circuit
CHAPTER FIVE
CONSTRUCTION AND PACKAGING
5.0 Component
Sourcing
5.1 Construction and
Testing
5.2 Audio Amplifying
Stage
5.3 Prototype
5.4 Trouble shooting
5.5 Packaging
CHAPTER SIX
6.0 CONCLUSION
6.1 Further study
and Design
REFERENCE
APPENDIX
CHAPTER
ONE
1.0 INTRODUCTION
Electronic inter communication is the process of exchanging
information between individuals over relatively long distance by the use of
electronic system connected together by communication cables or the instrument
cable or satellite links. A telephone system and an intercom system can be used
to achieve intercommunication.
In the department of Electrical/Electronics Engineering, Institute of Management and Technology, Enugu, there exists the
need for intercommunication between all the offices in the department so as to
enable the smooth running of activities. Where by information and ideas are
exchanged between the individuals concerned just at the press of a button. To
achieve this kind of situation and economical means of electronic communication
was considered.
Thus the intercom system was chosen so as interconnect the
three offices earlier specified. Other offices can also be attached/ connected
to the system as time goes on since thee is room for modification. One may ask
why the telephone system not considered since it is also another system of
intercommunication. The telephone system is equally better but less appropriate
since it requires a dedicated line form NITEL who charges bills accordingly.
The intercom system only makes use of the physical communication cables
interlinking the handsets concerned. Also, the telephone system requires PABX
system (Private Automatic Box Exchange) for effective communication between the
concerned telephone sets. The PABX is a high capacity telephone switching
equipment that automatically connects a call to the desired route or extension
number. It equally handles both external call and internal call. The telephone
set or system is more appropriate for a whole educational complex or
company.
It is not appropriate to use the telephone for the connectivity of few offices
as this under-utilizes the capacity of the PABX since they are designed
to handle high capacity of lines. Bearing cost in mind, the 3-way intercom
units is cheaper to construct when compared to the cost of procuring PABX
system talkless of design and construction.
By embarking on the 3-way intercom, this believed that an
efficient communication gadget or communication link between the offices shall
be achieved.
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