Invention Story of Electrocardiography (ECG) by Willem Einthoven

john November 7, 2013 No Comments
Invention of Electrocardiography (ECG) Have you ever wondered about how medical tools and equipments were designed? Ever raised a question if they were designed by a physician himself or a mechanical scholar? If yes, here is an interesting article that will fit your inquisitive nature. Hope you would have come across this device, the most essential electronic medical device, the Electrocardiogram or ECG. Read further to know about the invention story behind this most useful tool. Let us start...
read more

Invention History of Phototransistor and Photodiode

john November 6, 2013 1 Comment
Before touching the main topic of the invention history of the phototransistors, it is important to have a basic understanding on what phototransistors and photodiodes are. In simple words, a phototransistor is a transistor operated by light rather than electric current. In brief, a phototransistor is a bipolar transistor enclosed in a transparent case so that light can reach the base collector junction. This being the case of phototransistors, a photodiode is a kind of photo detector that is...
read more

Microprocessor – Invention History & Story Behind the Success of Intel

john November 5, 2013 1 Comment
Microprocessor – Invention History A simple integrated circuit that carries the central processing unit of a computer is the Microprocessor. Are you not fascinated to know what the history behind the invention of this tool is? If yes, this write up will help you know completely about how it was designed and the brains behind the scene. Before you know about the invention history of a microprocessor, let us check out what a real microprocessor is and what it...
read more

Invention History of Liquid Crystal Display (LCD)

john November 5, 2013 5 Comments
The history and development of the Liquid Crystal Display (LCD) is rather complex. The story of the LCD had an unusual beginning by an Austrian botanist in the 19th century. Though the LCD made a different and unstable start, its development proceeded from early successes like the pocket calculator to the key milestone of a flat panel television display that can be hung on a wall. The origin and development of the LCD spans the world’s major industrial centers...
read more

Invention History of C Programming Language and the Development of UNIX

john October 31, 2013 6 Comments
Invention History of C Programming Language There would be no surprise in saying that the C language literally shook the computer world? The impact of C cannot be underestimated because it completely changed the perspective with which programming was approached. The birth of the C language was a direct result of the need for a structured, efficient and a high level language that was capable of replacing the assembly code when creating systems programs. On the whole, The C...
read more

Invention History of Light Emitting Diode (LED)

john October 31, 2013 4 Comments
Most of us are aware that the semiconductor light-emitting diode or the LED is the major component of today’s technology. All our houses have plenty of tiny glowing indicators provided by LEDs; these indicators are employed for various aspects like reading CD and DVD disks in computer and game console drives or to transmit signals from remote controls to electronic equipment. Cars that are equipped with LED indicators are increasing in number these days. Most significantly, it should be...
read more

Capacitors – Invention History and the Story of Leyden Jar

john October 25, 2013 No Comments
Capacitors are a great example to prove the fact that even the simplest of devices can become complex over the years; in case of capacitors, it is nothing more than an insulator between two conductors and it has become pretty complex in this 250 years of technical evolution!! Almost all of us are familiar with the static charge that is generated by friction – a phenomenon known as triboelectricity. When you walk on a carpeted floor, pull a transparent...
read more

Radio-Invention History & The Story of Fight for Patents

john October 24, 2013 No Comments
Radio – Invention History The invention history of the radio is not only interesting but rather long as well. If you ask who invented the radio, probably you will get the name Marconi. But, was it really Marconi who invented the radio? Well, you have to determine for yourself after going through the journey of the invention history of the radio. There are a lot of knots to be untangled if you want to arrive at an answer as...
read more

Microcontroller – Invention History and Story Behind the Scenes

john October 23, 2013 4 Comments
Invention History of Microcontroller Would you believe that each one of you is using at least 20 microcontrollers in your house??!! Well, that’s a fact. There are more than two billion microcontrollers being produced every year. Almost everybody in developed as well as developing nations cannot think of a day without using microcontrollers. The microcontroller is an embedded computer chip that controls most of the electronic gadgets and appliances people use on a daily basis, right from washing machines...
read more

Image Representation in MATLAB – How to Represent Binary,Grayscale & Color Images

Avaneet Ranjan October 23, 2013 1 Comment
In this article, we are going to talk about images, their types and some basic functions for Images. This article is part of our MATLAB tutorial series, which we are developing for Image processing through MATLAB. We expect you to give us feedback, so that we can keep the information flow more efficient, informative and up to the mark. In the first chapter, you have learned an introduction to MATLAB and its commands. In this chapter you will learn how...
read more

Object counter using 8051

admin January 23, 2018 25 Comments
Object counter using 8051 microcontroller. This article is about a simple object counter/visitor counter using 8051 microcontroller . AT89S51 belonging to the 8051 family is the microcontroller used here. This circuit can count the number of objects passing across a line , number of persons passing through a gate/door and so on. The can be simply divided into two sections i.e. the sensor section and the display section. Sensor. The sensor part consists of a ultra bright led (with...
read more

Zener Diode – Invention History & Story Behind the Development

john October 2, 2013 1 Comment
As we all know, a Zener Diode is used for regulating voltage in practical circuit applications. Though we know about the importance of this device, do we really mind knowing about how it was invented? If you had that query in your mind, then reading further would give you a thorough knowledge on the discovery of Zener Diode and its properties. You shall also be informed of the great scientists who worked on this device. Before going into the...
read more

Shockley Diode – Invention History

john October 2, 2013 No Comments
What is a Schockley Diode? In simple terms, a Shockley diode is a four layered semiconductor diode. In electronic terms, it is a “P-N-P-N” diode and is equivalent to a thyristor with a disconnected gate. Though this basic diode does not find much application in electronic circuits nowadays, the concept is largely employed and is one of the remarkable inventions in the history of electronics. The interesting history of the Shockley diode cannot be interpreted without mentioning a few...
read more

Digital Count Down Timer using PIC Microcontroller

mithun_das October 3, 2013 17 Comments
In this article, our author Mithun has developed a 0 – 99 min counter using PIC microcontroller 16F628A. So basically this is a digital count down timer ideal for engineering and diploma students for their project requirements. We have given complete circuit diagram of the digital count down timer along with full source code. In addition, photographs of the breadboard setup is uploaded. Every micro controller has a timer unit inside. A timer is nothing more than a time...
read more

Digital Voltmeter using Micro Controller PIC16F73A

mithun_das October 2, 2013 11 Comments
In this article, we have come up with a new PIC micro controller project. Our author Mithun has created a Digital Voltmeter Circuit using PIC16F73A and multiplexed 7 segment displays. The circuit is well explained with diagrams and the source code (written in Embedded C language) is available for download.  If you have any doubts while implementing this project, please feel free to ask in comments. Note:- You may also like to read our Digital Voltmeter using 8051 created...
read more

DatasheetLib – A new Datasheet Database Website to revolutionize Datasheet Discovery

jojo September 23, 2013 1 Comment
Electrical engineers all over the world would bet anything for a better datasheet search engine. Its such an under served  market that there are still rooms for improvement. Although there are hundreds of websites which supplies datasheets in the form of PDF like DatasheetCatalogue, AllDataSheet and many others, recently launched DatasheetLib follows a different approach from the existing players. In this article my aim is to compare different datasheet providing websites and see how they all are different from...
read more

Solar Cell – Invention History & Story – From Selenium to Silicon

jojo September 20, 2013 4 Comments
Invention History of Solar Cells – From Selenium to Silicon Well, the definition of a solar cell is simple. It is a device that directly converts the energy from sunlight into electrical energy. However, its horizons are really vast. The most significant fact is that the invention of this wonderful device didn’t happen overnight. Interestingly, the concept of solar technology is nearly three millenniums old. The first use of this wonderful technology dates back to 7th Century BC. First...
read more

Vacuum Tube Invention History and Story behind Invention

jojo September 11, 2013 3 Comments
The story behind the invention of vacuum tube   Anything in Science has its own history and some hidden truths behind its invention. It must be fascinatingly curious for any science savvy person to know the invention story of technical tools, and other innovations of Science. This is one such write up which will help you know about the researches and the advancements in the invention of the vacuum tubes. Vacuum tube? Vacuum tubes are sealed glass tubes made...
read more

Integrated Circuit Invention History and Story Behind the Scenes

jojo September 6, 2013 6 Comments
Invention of Integrated circuits – Behind the scene Have you ever heard the story behind  invention of  integrated circuits or what made people work on it? Well, if your answer is ‘No’, continue reading to unveil the truth. This article takes you through the path of invention and developments of integrated circuits. What are Integrated circuits? An integrated circuit is just a small chip that performs multiple functions. It clubs together functions of many electronic components like an oscillator,...
read more

Introduction to MATLAB Tutorial

Avaneet Ranjan September 2, 2013 11 Comments
In this article, we are giving an introduction to MATLAB. This article is part of a tutorial series we are developing for MATLAB. We hope you to give us feedback, so that we can improve our MATLAB tutorial series. What does MATLAB stand for? MATLAB stands for MATrix LABoratory. Hence, as the name suggests, here you play around with matrices.  Using MATLAB an image (or any other data like sound, etc.) can be converted to a matrix and then...
read more

Taking Down Forums in CircuitsToday

jojo August 27, 2013 2 Comments
Hi Friends,  2 years before, we have launched Forums in CircuitsToday with great expectations. However due to lack of time on our side, we failed to monitor the forums properly. Above all the software we bought to power forums was too susceptible to spam activities. We had a tough time dealing with “automated spam” activities in forums. In 2 years time, the forum was dominated by spammers than real users. This was an unexpected and hard situation. Though we...
read more

The Story & History of Transistor Invention

jojo September 1, 2013 6 Comments
Transistors and its path of invention We all know “transistor” is an integral part of any electronic circuit/device. It is very rare to see any circuits built without at least one transistor. This  semiconductor device is used either for switching purposes or for amplification purposes in electronic devices. They are either packed separately or found coupled to the integrated circuits.Transistors are of two types, PNP and NPN. Most commonly NPN transistors are used. In this article, lets go deep...
read more

Pulse Width Modulation – What is it?

Anish August 17, 2013 6 Comments
The good definition of Pulse Width Modulation (PWM) is in the name itself. It means modulating/varying the width of the pulse (Not the frequency). To best understand what PWM is, let us first see some basic terminologies. Microcontrollers are intelligent digital components which live on binary signals. Best representation of a binary signal is a square wave. The following diagram explains the basic terminologies associated with a square wave signal. As the shown in the above diagram, the important...
read more

The Story of PN Junction Diode

jojo August 27, 2013 7 Comments
I am really excited by the amazing comments & responses I got for my two articles on PN Junction. If you have not read them yet, here they are – 1) Understanding the PN Juction and 2) PN Junction Diode Characteristics. In those 2 articles, I have tried to demystify PN Juction and explain it in very simple words. From those good responses, I assume my attempt has been successful to some extent. In this article, my objective is...
read more

Breathalyzer circuit using 8051

admin March 12, 2014 15 Comments
Alcohol Breathalyzer circuit using 8051 microcontroller (AT89S51). This article is about a breathalyzer circuit using 8051 microcontroller which outputs the blood alcohol content (BAC) from the breath. The BAC is displayed in percentage on a 3 digit seven segment display. The microcontroller used if AT89S51 which belongs to the 8051 family and the alcohol sensor is MQ135 gas sensor from Futurelec. MQ135 gas sensor. MQ135 is a stable and sensitive gas sensor which can detect  ammonia, carbon dioxide, alcohol,...
read more