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Ink Cartridges

I use ink cartridges in my printer and you probably do as well. The advent of inexpensive inkjet home printers in recent years has created a world where most of us have ink cartridges. Did you ever wonder what the history of these handy containers of ink might be? How did we come from the days of ink wells and feather quills to printing everything possible, even photographs, right in our homes?

Before 1984, ink cartridges were unknown. While printers had been around for years, they all used either difficult-to-install ribbons or messy toner cartridges. Changing these devices was a messy job that often ruined business attire worn by the unfortunate person stuck making the change. The delivery of the inking agent as unreliable at best; and the paper jams plagued the dot matrix printer to such an extent that the industry began to see other solutions for ink delivery and printing.

Of course, back in those days, few people yet had a computer at home, much less a printer of any kind. As a result, there was no need for ink cartridges in the home.

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How Remote Works?

The world’s first remote controls were radio-frequency devices that directed German naval vessels to crash into Allied boats during WWI. In WWII, remote controls detonated bombs for the first time. The end of the great wars left scientists with a brilliant technology and nowhere to apply it. Sixty years later, some of us spend an hour looking for the remote before we remember there are buttons on the TV.

In this article, we’ll examine the infrared technology used in most home theaters, look at the difference between IR and RF remotes, find out the difference between a “universal” and a “learning” remote and check out some of the other high-tech features you can find on remotes today, like PC connectivity, RF extenders and macro commands.

Infrared Remote Controls: Inside
The dominant remote-control technology in home-theater applications is infrared (IR). Infrared light is also known as plain-old “heat.” The basic premise at work in an IR remote control is the use of light to carry signals between a remote control and the device it’s directing. Infrared light is in the invisible portion of the electromagnetic spectrum.

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How fan works

This is one question that hasn’t been asked much. In fact, many people just aren’t interested in ‘how stuff works’ thematics. In this article, I should try to explain how a DC brushless fan works and all the stuff that goes with it, like RPM sensor location, overvolting, etc.
Now, let’s break the dogma. A DC brushless electromotor is mainly a step-motor with a rotor made out of permanent magnet, and a stator made out of coils (mostly 4 coils, but it depends on the type of step-motor). As this is a step-motor, it needs some kind of regulator, which is made on a little electronic board. So… a DC brushless motor is made out of 3 things:

* Electronic Circuit Board
* Coils
* Permanent Magnet
Permanent Magnet:

This is the mostly known part of the electromotor. I think that I don’t need to explain much about it. It has two poles – north and south, and using the external magnetic field it is possible to move the magnet around. In a fan, the magnet is circuit-shaped and it rotatrd around its axis.

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Detail about capacitor

In a way, a capacitor is a little like a battery. Although they work in completely different ways, capacitors and batteries both store electrical energy. If you have read How Batteries Work, then you know that a battery has two terminals. Inside the battery, chemical reactions produce electrons on one terminal and absorb electrons on the other terminal. A capacitor is much simpler than a battery, as it can’t produce new electrons — it only stores them.

In this article, we’ll learn exactly what a capacitor is, what it does and how it’s used in electronics. We’ll also look at the history of the capacitor and how several people helped shape its progress.

Inside the capacitor, the terminals connect to two metal plates separated by a non-conducting substance, or dielectric. You can easily make a capacitor from two pieces of aluminum foil and a piece of paper. It won’t be a particularly good capacitor in terms of its storage capacity, but it will work.

In theory, the dielectric can be any non-conductive substance. However, for practical applications, specific materials are used that best suit the capacitor’s function. Mica, ceramic, cellulose, porcelain, Mylar, Teflon and even air are some of the non-conductive materials used. The dielectric dictates what kind of capacitor it is and for what it is best suited. Depending on the size and type of dielectric, some capacitors are better for high frequency uses, while some are better for high voltage applications. Capacitors can be manufactured to serve any purpose, from the smallest plastic capacitor in your calculator, to an ultra capacitor that can power a commuter bus. NASA uses glass capacitors to help wake up the space shuttle’s circuitry and help deploy space probes. Here are some of the various types of capacitors and how they are used.

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