Design And Construction Of An All-In-One Tester Circuit

The Design And Construction Of An All-In-One Tester Circuit Complete Project Material (PDF/DOC)

Overview

All in one multi-tester is quite expensive which may not affordable for every electronics beginners. This work is on a cheap all in one tester circuit that can be used to test the condition of almost all the electronics component from basic resistor to advance ICs. The circuit all in one tester is used to detect polarity, continuity, logic sate and also activity of multivibrator.

TABLE OF CONTENTS

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWLEDGEMENT

ABSTRACT

TABLE OF CONTENT

CHAPTER ONE

1.0 INTRODUCTION

1.1      BACKGROUND OF THE PROJECT
1.2      AIM OF THE PROJECT
1.3      OBJECTIVE OF THE PROJECT
1.4      SIGNIFICANCE OF THE PROJECT
1.5      PURPOSE OF THE PROJECT
1.6      APPLICATION OF THE PROJECT
1.7      ADVANTAGES OF THE PROJECT
1.8      PROBLEM/LIMITATION OF THE PROJECT
1.9      PROJECT ORGANISATION

CHAPTER TWO

2.0 LITERATURE REVIEW

2.1 REVIEW OF RELATED STUDIES

2.2 REVIEW OF RELATED TERMS

CHAPTER THREE

3.0 CONSTRUCTION METHODOLOGY

3.1 SYSTEM CIRCUIT DIAGRAM

3.2 SYSTEM OPERATION

3.3 CIRCUIT DESCRIPTION

3.4 SYSTEM CIRCUIT DIAGRAM

3.5 CIRCUIT OPERATION

3.6 IMPORTANCE AND FUNCTION OF THE MAJOR COMPONENTS USED IN THIS CIRCUIT

3.7 POWER SUPPLY UNIT

CHAPTER FOUR

RESULT ANALYSIS

4.0 CONSTRUCTION PROCEDURE AND TESTING

4.1 CASING AND PACKAGING

4.2 ASSEMBLING OF SECTIONS

4.3 TESTING

4.4.1 PRE-IMPLEMENTATION TESTING

4.4.2 POST-IMPLEMENTATION TESTING

4.5 RESULT

4.6 COST ANALYSIS

4.7 PROBLEM ENCOUNTERED

CHAPTER FIVE

5.1 CONCLUSION

5.2 RECOMMENDATION

5.3 REFERENCES

Description of All in One Tester Circuit

The circuit of all in one tester is so simple that it can also understand by beginners. The circuit of all in one tester contains two transistor and very few other passive components. Transistor T₁ and T₂ is used here as switch, driving the one half of bicolor LED each in order to give result of the test.

Initially, the circuit is in off mode, when switch SW₁ is pressed, transistor T₁ stops conducting due to lack of forward bias. At the same time transistor T₂ takes base bias voltage from the battery through resistor R₁ and conducts. This allows the red half of bicolor LED₁ to illuminate.

Transistor T₁ conducts when the positive voltage through resistor R₃ is given to base of transistor T₁ and light up the green half of LED₁. In conduction of transistor T₁ transistor T₂ turns off and vice-versa.

Thus from the description, we know that the functioning of the circuit thus depends on the signal obtained at the base of transistor T₁. The table below gives the testing procedure for various components with the expected indication or result.

Bi-Color LED Status for Various Tests
Component/test	Test Procedure	LED₁ Status	Result	Note
Continuity	Red and black probes to the test points	Green ‘on’	Continuity
		Red ‘on’	No continuity
Polarity	Red probe to the positive of the circuit and black probe to the test point	Green ‘on’	Positive	Circuit should be ‘on’
		Red ‘on’	Negative or no power
Logic	Red probe to the circuit’s positive and black probe to the output	Green ‘on’	High	Circuit should be ‘on’
		Red ‘on’	Low
IC	Red probe to the circuit’s positive and black probe to the output	Green ‘on’	High	Circuit should be ‘on’
		Red ‘on’	Low
Multivibrator IC 555	Red probe to the circuit’s positive and black probe to the output	Color changes from red to yellow to green clinically	IC oscillating	Circuit should be ‘on’
		Red ‘on’	No oscillation
Electrolytic Capacitor	Red probe to the positive and black to the negative lead	Green gradually turns red	Capacitor good	Capacitor should be discharged
		Red ‘on’	Capacitor faulty
Diode (LED/Photodiode/IR diode)	Red probe to the anode and black probe to the cathode	Green ‘on’	Good	1 killo-ohm resistor should be connected to the anode of LEDs
	Red probe to the cathode and black probe to the anode	Red ‘on’	Good
	In both conditions	Color remains the same (either green or red)	Open /short
Resistor (1 ohm to 500 Kilo ohms)	Red and black probes to the ends of the resistor	Green ‘on’	Good
		Red ‘on’	Faulty
Transistor	Red probe to the base of the transistor and the black probe first to the collector and then to the emitter	Green ‘on’ and again green ‘on’	Transistor conducts	Circuit should be ‘on’
	Black probe to the base of the transistor and red probe first to the collector and then to the emitter	Green ‘on’ and then red ‘on’	Transistor doesn’t conduct

PARTS LIST OF ALL IN ONE TESTER CIRCUIT

Resistor (all ¼-watt, ± 5% Carbon)

R₁ = 1.8 KΩ

R₂ = 1.5 KΩ

R₃ = 4.7 KΩ

Capacitor

C₁ = 1 µF, 16V (Electrolytic Capacitor)

Semiconductors

T₁, T₂ = BC548 (General Purpose NPN Transistor)

D₁ = 1N4001 (General Purpose Rectifier Diode)

LED₁ = Bi-color LED

Miscellaneous

B₁ = 9V battery

SW₁ = on/off switch

Chapter Two

2.0 LITERATURE REVIEW
2.1 Introduction
The chapter presents a review of related literature that supports the current research on the Design And Construction Of An All-In-One Tester Circuit, systematically identifying documents with relevant analyzed information to help the researcher understand existing knowledge, identify gaps, and outline research strategies, procedures, instruments, and their outcomes…

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Design And Construction Of An All-In-One Tester Circuit

The Design And Construction Of An All-In-One Tester Circuit Complete Project Material (PDF/DOC)

Description of All in One Tester Circuit

Bi-Color LED Status for Various Tests

PARTS LIST OF ALL IN ONE TESTER CIRCUIT