Working of UPC Bar Codes

john December 11, 2013 No Comments
The “Universal Product Code”, also known as UPC Bar Code can be found in almost all packages that you buy from department stores, grocery stores or any other stores. In this post we will discuss on where these codes come from and their actual use. You can also go through the topic Invention Story of Barcodes to get a better idea. Origin of UPC Bar Code The UPC was first developed by a company called Code Council so...
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Working of Facial Recognition System

john May 14, 2010 2 Comments
We have seen the use of facial recognition technology in many movies. A photo of the person to be identified will be obtained from some hidden camera. It will then be run in through the police database so as to find a match with their existing records. At last a match will be found and the criminal will be caught red handed. Though this may seem fascinating in movies, it may not be the same in real world. The...
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Direct To Home (DTH) Technology – Working

john May 4, 2010 6 Comments
Overview Direct to home technology refers to the satellite television broadcasting process which is actually intended for home reception. This technology is originally referred to as direct broadcast satellite (DBS) technology. The technology was developed for competing with the local cable TV distribution services by providing higher quality satellite signals with more number of channels. In short, DTH refers to the reception of satellite signals on a TV with a personal dish in an individual home. The satellites that...
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Basic Soldering Tips

john October 19, 2011 3 Comments
Almost all the electronic circuits mentioned in this site are designed and built on a PCB board. But you cannot build these electronic circuits if you do not know the basics of soldering.  If you do not know to solder well, the solder joints will not be perfect and thus the circuit will have serious flaws. In this post, we will discuss about the soldering tools or soldering kits that are used for this purpose. We will also have...
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Working of Electronic Ink (E-ink) Technology

john October 19, 2011 1 Comment
“] Electronic Ink [E-ink We have seen the working of electronic displays like Liquid Crystal Displays, SED TV’s, and Touch screen technology and so on. Even though we rely mostly on monitors nowadays we must not forget the fact that the basic display mechanism is paper the early 105 AD when the Chinese invented it. Before the invention of paper, the only way to print your writing was on silk scrolls, which only wealthy people could afford. This would...
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Ink-free Mobile Photo Printer Technology

john October 19, 2011 3 Comments
We tend to store all photos digitally rather than keeping a hard copy of them. Whenever we need to see them or show it to our friends, we take it from our mobile and show them. All we do is waste more of our digital space. There is nothing satisfactory like watching and enjoying our photos as a hard copy. The main reasons that restrict us from making a hard copy are laziness and inconvenience. For taking a high...
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Working of Fingerprint Scanner

john November 15, 2011 9 Comments
For the past few years fingerprint scanners were considered to be a very costly and high end technology. We have seen it only in thriller and sci-fi movies. But now, these devices have been popping up in almost all places like offices, police stations and also our laptops. You also get to buy fingerprint USB scanners for almost $100. In this post we will learn the use, applications and also the working of fingerprint scanners in detail. Use of...
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Touch Screen Technology – Working

john July 25, 2011 2 Comments
  Nowadays, there are a lot of touch screen monitors available in the market. They are made available in displays for computers, personal digital assistants, mobile phones and video games. A touch screen contains a visual display area which can be sensitive to the touch of our finger or other passive components. A touch screen is only called so if the contact made with it is physical in nature. The common physical contacts made for a touch screen technology...
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Strain Gauge

john April 7, 2010 4 Comments
A strain gauge is a device that is used to measure the strain that occurs in an object. The device was invented in the year 1938 by Edward E. Simmons and Arthur Ruge. The device is still being used in many electronic circuits mainly as the principle sensing element for sensors like torque sensors, pressure sensors, load cells and so on. Strain Gauge Working Principle Although strain gauges are available in many shapes and sizes, the fundamental working of...
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Wheatstone Bridge Circuit

Wheatstone Bridge Circuit

john July 29, 2018 1 Comment
What is a Wheatstone bridge? A Wheatstone bridge is an electrical circuit used to calculate an unknown resistance with the help of a bridge circuit. For this, the two legs of the bridge circuit are kept balanced and one leg of it includes the unknown resistance. The Wheatstone bridge principle is similar to the working of potentiometer. Slight modifications in the Wheatstone bridge can help in finding other quantities like capacitance and inductance as well. It also helps in finding...
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