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

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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

Ch

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

LITERATURE REVIEW
This section 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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Electrical Electronics Engineering (2458), Industrial Physics (868), Physics (886)
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