The purpose of this text is to present at a primary and intermediate level a comprehensive over view of the construction principle and indeed the operation of a Digital Incubator.  We want to present a situation where by as the temperature in going up let the resistance be decreasing and as the temperature decreases let the resistance be going up. The history and importance of Electronics as a unique branch of science cannot be over emphasized Electronic as its history might have it, is divided into two periods.  The first began with the invention of the vacuum tube, the second, occupying the later half of the twentieth century in based on the invention of the transistor. Since Electronic is the branch of science and Technology relating to the conduction and control of electricity flowing through semi-conductor materials through vacuum are based.  Its application to industry will be concerned with the design, manufacture and application of transistors, dides, integrated circuits and other semi-conductor devices and to a much lesser extent vacuum tubes. Therefore, it is a fact crystal clear, that it is from the above breed and follow up from the electronic industry that such devices like Digital incubator was able to be made, Digital incubator is therefore device designed to keep chicken and babies at a required temperature when they are delivered prematurely especially as it applies to babies.  It is used to keep them worm. It is commendable to note here that with the help of this digital work on construction and operation of digital incubator, students of electronic engineering now have a text to lay hands on. TABLE OF CONTENTS Title page Approval page Dedication Acknowledgement Table of contents Preface CHAPTER ONE INTRODUCTION CHAPTER TWO PROJECT REVIEW CHAPTER THREE COMPONENT DESCRIPTION 3.0 INTRODUCTION 3.1 TRANSFORMER 3.1.1 STEP- DOWN TRANSFORMER 3.1.2 Step-up transformer 3.1.3 Transformer Ratings 3.2 RESISTOR 3.3 CAPACITOR 3.4 DIODE 3.5 RECTIFIER 3.6 TRANSISTOR 3.7 RELAY 3.9 LIGHT EMITTING DIODE (LED) CHAPTER FOUR THE PRINCIPLE OF OPERATION OF A DIGITAL INCUBATOR. 4.1 VERO BOARD: 4.2 HEATING ELEMENT (BULB) 4.3 FAN 4.4 CABLES CHAPTER FIVE PACKAGING AND DESIGN 4.6 MOUNTING PROCEDURE CHAPTER SIX CONSTRUCTION AND TESTING  6.1 TESTING THE CIRCUIT CHAPTER SEVEN CONCLUSION PROJECT COST  BIBLIOGRAPHY

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