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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, Teleprompters, telegraphs etc. an example of intercom system since 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

CHAPTER ONE

1. 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/Electronic 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 there 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 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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