Designing and implementing multiple intercom system that will work without charges has always been a prominent field of interest among many researchers and developers. This project presents developments and potentials of a two way intercom system that allow two way conversations from one location to another within a particular place such as offices, homes, workshops, warehouse. This project writing discussed an intercom system and its component make-up, operation applications and other relevant issues as regards to intercom system. The basic element used in this project are tone generator, audio input source, audio amplifier, output device and medium (cable). As both microphone (input source) are always in operation, 1000uf capacitor was used in the power circuit to avoid loud speaker from being picked up by the microphone enclosed in the same box, causing a very undesired and laud.

TABLE OF CONTENTS
COVER PAGE
TITLE PAGE
APPROVAL PAGE
DEDICATION
ACKNOWELDGEMENT
ABSTRACT
CHAPTER ONE
INTRODUCTION
1.1      BACKGROUND OF THE PROJECT

1. OBJECTIVE OF THE PROJECT
2. PURPOSE OF THE PROJECT
3. SIGNIFICANCE OF THE PROJECT
4. PROBLEM AND LIMITATION OF THE PROJECT
5. SCOPE OF THE PROJECT
6. PROJECT ORGANISATION

CHAPTER TWO
LITERATURE REVIEW

1. HISTORICAL BACKGROUND OF THE PROJECT
2. REVIEW OF 2-WAY INTERCOM

CHAPTER THREE
SYSTEM DESIGN

1. DESCRIPTION OF THE SYSTEM BUILDING BLOCK
2. SYSTEM DESIGN SPECIFICATION
3. BLOCK DIAGRAM OF THE SYSTEM
4. DESCRIPTION OF THE OVERALL OPERATION OF THE SYSTEM
5. LIST AND DESCRIPTION OF THE SYSTEM COMPONENTS
6. COMPLETE CIRCUIT DIAGRAM

CHAPTER FOUR

1. IMPLEMENTATION, TESTING AND RESULTS
2. CONSTRUCTION PROCEDURE AND TESTING
3. INSTALLATION OF THE COMPLET DESIGN 
4. CASING AND PACKAGING
5. ASSEMBLING OF SECTIONS
6. TESTING OF SYSTEM OPERATION
7. PROBLEM ENCOUNTERED

CHAPTER FIVE

1. COST OF ANALYSIS
2.  CONCLUSION
3.  RECOMMENDATION
4. REFERENCES

 

 

 

 

CHAPTER ONE
1.1                                                        INTRODUCTION
An internal communication system is a system that basically transfers information in the form of electrical signal from one spot to the other within a confirmed location. It is also a private telecommunication system that allows typically two or more location to communicate with each other like telephone does. An intercom is also a personal telecommunications device which facilitates the exchange of messages between two or more locations where standard vocal communication would be difficult or impossible due to distance or obstructions. This project two way intercom system consist of station linked to each using wire. It uses full duplex mode a process whereby one can transmit and receive voice calls simultaneously which made transmission medium to be your wires between the two nodes and typical headers on the nodes (separate speaker and microphone, good isolation from sound coming from speaker to the mic element).

1.2                                           BACKGROUND OF THE STUDY
Technology now has made it possible for various instrument or device to be designed and constructed in other to make human life more profitable and enjoyable. These days, a lot of devices are built based on electrical approach. One of these devices is known as an intercom system. Perhaps one needs an internal communication. May be may be one want to be able to communicate with his home from his office or garage. Or in a case one is upstairs in a bedroom doing his or her schoolwork, and wants to know when dinner will be ready. May be the person is too weak to get up and shout down the stairs to find out if so, then this simple intercom will help him or her to get the information he or she needs. It works without6 charges on like the telephones.
Two way wired intercom systems enables sound or speech to be transmitted in two directions, therefore enabling a conversation. Intercoms are generally compared of fixed microphone/speaker units which connect to a central control panel. In general, a communication system requires three things namely; a transmitter a propagation medium and a receiver. The information to be transferred may be in analog form (example, voice or audio) as in the case of this study where voice is the source of information, or in digital form (computer data, digitalized form and so on).

1.3                                          OBJECTIVE OF THE PROJECT
The objective of this work is to design a device that can be used to communicate among two individuals in different parts of the home and in the case of injury or emergency.

1.4                                              STATEMENT OF PROBLEM
In a business organization, shops, stores and stressful in relating/ delivering information between each other within a particular building. The servant finds it laborious going to the boss always whenever he /she has information to deliver or wants to carry out action(s) with respectto the master’s authority. Therefore, this project work is to address this issue, looking forward to eliminating the stressful manpower involved and to facilitate information delivery, making communication easier. The intercom system forming the basic of this study and designed to serve the HOD’s office and the secretary’s office for internal communication.

1.5                                              PURPOSE OF THE PROJECT
(1) The main objective of this project is to construct a two way wired intercom that will help two persons or more to communicate with each other within a particular domain, like offices homes, warehouse e.t.c.
(2) To build a telephone that will transmit signal via a medium at no cost.
(3) To immensely help the engineering students understand the technology behind two way simple intercom and its practical development.

1.6                                             SIGNIFICANT OF THE STUDY
The design and construction of two way intercom system will help students or individual to understand the basic knowledge of intercommunication industries, also it’s a means to replace man’s labour and stress of walking over a given premises for information delivery. These station wired intercom system can be used as a door phone, connecting from the house to the door to screen visitors to the house. The wife, after preparing dinner, can through this system call on the husband in his bedroom to the dinner table. Generally, intercom system can be used for message broadcast (in case of multi-channel intercom), as door phone, monitoring etc.

1.7                                                      SCOPEOF PROJECT
The scope of this project work design of simple two way intercom system is to limited to the design, construction and test on a two station simple intercom system with specification that;

1. The demodulator should operate with a minimum distortion while producing an adequate output
2. The small signal amplifier must provide an undistorted signal into the buffer amplifier to be able to drive a speaker of 8 ohms impedance.
3.  A 9 volt d.c power supply is to be design and employed to power the simple intercom for operation at each station.
4.  Result shall fully be discussed while suggestions for further study made.

1.8                          PROJECT WORK ORGANISATION
The various stages involved in the development of this project have been properly put into five chapters to enhance comprehensive and concise reading. In this project thesis, the project is organized sequentially as follows:
Chapter one of this work is on the introduction to a 2-way wired intercom. In this chapter, the background, significance, objective limitation and problem of  2-way wired intercom were discussed.
Chapter two is on literature review of  2-way wired intercom. In this chapter, all the literature pertaining to this work was reviewed.
Chapter three is on design methodology. In this chapter all the method involved during the design and construction were discussed.
Chapter four is on testing analysis. All testing that result accurate functionality was analyzed.
Chapter five is on conclusion, recommendation and references.

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