Category: Technology

Green Laser Pointers

The green beam is produced at a visible light frequency of 532nm and utilizes “frequency doubling” crystal technology in order to produce the bright green light. The crystal actually produces an IR (infrared) beam at around 808nm which is doubled and then collimated producing the illuminating green laser light.

Hand held pointers are a very practical form of technology, but they have also found a strong hold amongst gadget enthusiasts and laser astronomers alike. Green lasers are so useful for astronomy applications because of how bright the beam is. For years the only available form of hand held laser technology came available to produce the red laser beam. This is less bright in comparison to a green beam, so as technology improved and pointers became widely available for lower costs, the entire community of astronomy slowly but surely updated their tools to meet current standards.

Learning is far easier when a beam is clearly visible through the night sky and green lasers can even be used during broad daylight at certain higher powers. Technology has allowed for world record breaking lasers which are capable or producing a beam visible at a distance of 100 miles or more. Its just too bad the earths curvature only allows for 12 miles of this beam to be seen on a flat surface, but that still does not take away from the fact that certain units are the worlds brightest life saving flares.

SCUBA divers from around the world have taken advantage of submergible products a safety tools as well as a source of light under water. These professional grade hand held units are not only available to professionals though, anyone with the right budget can obtain one of these exclusive laser pieces if you know where to look. Green laser pointers are not toys and should be handled with extreme care. Because so many products produce high output powers and produce intense light radiation, laser safety and education is a must for safe green laser use.

Printer Fuser Units

Fuser Units

A fuser unit is the part in a laser printer that creates pressure and heat to fuse toner to the paper. Not all of the parts go bad in the whole assembly when they wear out. The main part that wears out is the upper heat roller or the heat sleeve. The coating wears off and causes the toner to not fuse properly. There are replacement rollers and sleeves on the market that you can replace and turn a non-functional fuser into a good working one.

Rebuilding fuser assemblies is not a new thing. Copier technicians have been doing it for years since the first office copier was created. When the fuser wears on any copier they replace certain parts some of which are, the upper heat roller, lower heat roller, bearings, picker fingers, thermistors, drive gears and more. The printer industry has a different approach in that they replace everything as an assembly. People are accustomed to this and when they need a replacement fuser they opt for a new one many times. I believe it is a mind set. A copier service person would look at it as a waste of money. Why buy a new one when you can buy the replacement parts for a fraction of the cost and install them and make it as good as new. You must be cautious when purchasing replacement parts because there are some replacement parts that are sub par, so finding a good parts source is imperative.

Refurbished Fusers

Pros Cost much less than a new assembly.

Cons Higher defect rate if you don’t find a quality manufacturer.

New Original Fusers

Pros You know for sure that what you are getting is as good as there is.

Cons Cost is much higher than a refurbished fuser. These too can be defective out of the box.

I have replaced many fusers and believe that using refurbished fusers is the way to go. It will not harm the machine and I have seen refurbished fusers last longer than new fusers. You will save money and don’t forget about the recycling aspect. There could be tons of old fuser cores in the land fills if it wasn’t for refurbished fusers. The pros out way the cons when it comes to refurbished fuser units. It is critical that you find quality refurbished fusers with a good warranty and you will save a lot of money while helping keep our landfills from filling up with old fuser units.

Transistor Cross Reference

The famous transistor cross reference book is the Philip ECG semiconductor master replacement guide. In the content you can find all kind of electronic components specification and ic schematic too. It is one of the must ‘have’ semiconductor guide for those who love electronic troubleshooting. The internal diagram or layout of ic is clearly drawn and the transistor parameters were also listed in this book. The price of this guide is not expensive and as an electronic repairer you should buy one. Just imagine without this book, you will be facing difficulty finding the right component for substitution.

In this book, many types of transistor data and specification were listed such as the bipolar transistor, silicon controlled rectifier, fet field effect transistor (Mosfet), junction field effect transistor (jfet), signal transistors, high voltage transistor such as the horizontal output transistor (HOT), silicon power transistor, surface mounted transistor, digital transistor and many other types. Although you can find a substitution part number from the normal transistor data guide book, the ECG philips master replacement book is more informative. The normal transistor replacement book only provide the voltage (v), current (amp) and wattage (w) rating for HOT but the ECG master equivalent guide show beyond than that such as the frequency , current gain (hfe) and the outlook too . Other than HOT, the normal transistor data book gives a superb or quite accurate comparison part number for you to refer.

There is one secret that I want to share to you about transistor cross reference equivalent. If you are searching substitution part number for a signal transistor, a higher voltage, ampere, and wattage will be enough but not in the case if you want to find a substitution part number for horizontal output transistor (HOT). Higher voltage, ampere and wattage will not always work because there is few more parameter that you need to take into consideration. You may ask why the transistor blow even if it has a higher voltage, higher current and higher wattage compare to the original one.

The other parameter that you need to see is the switching time which we call it the storage and fall time. Different HOT have different spec, if you really want to find a substitution for HOT, make sure you check out the storage and fall time parameter besides the higher voltage, current and wattage rating. Searching the internet for the components specification is easy-just type in the component part number follow by datasheet, data sheet, specification, spec, data, equivalent, part number, identification, marking, pinout, types, codes and cross reference. Usually the manufacturer’s website will appear and follows by other electronic supplier website. Click on the websites that you think is relevant to your search and hope you will get what you are searching.

As for the above secret, actually I have tested on quite a numbers of Monitor with the storage and fall time slightly out from the original parameter. After the replacement, the Monitor works fine but only for a very short period before it gets very hot. If I continue to let the Monitor run, I believe the HOT will blow! When I replaced the HOT with another equivalent part number that have the specification about the same as the original one, (especially the storage and fall time), the Monitor run perfectly well. My rule of thumb is, always get the exact part number first before using other number that you found from transistor cross reference book.

Computer Monitors

Monitors

Flat panel LCD monitors look great and will save room on your desk; CRT monitors also work well and can be less expensive. Most new desktop computers include two connectors to support dual monitors. Many new desktop computers support dual monitors without requiring any additional hardware. Having two monitors will forever change the way you work with your computer. One thing to note is that LCD monitors are typically sized by their actual viewable diagonal measurement, but CRTs typically are not.

Screen

There are two types of Infrared touch screen monitor screens, the first reacts to infrared or thermal waves (heat), unfortunately this technology is slow and does not work well with cold hands or objects. The second type of Infrared touch screen monitors use vertical and horizontal infrared sensors around the perimeter of the touch screen. You can never have enough screen space, especially when organizing and working on your digital pictures. There are several different ways you can make use of this extra screen space when working at home or in your office. The wide screen format also helps to put more on screen for landscape mode images.

CRT type monitors are the traditional monitors that we have been using for years. LCD type monitors are based on a newer technology and are becoming very popular, mainly because they have great space and energy saving advantages over CRT monitors. CRT and LCD monitors are based on completely different technologies, and thus have quite different display characteristics.

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Flat Screen Computer Monitors

New things often push aside older products. Flat-screen computer monitors have become the most sought-after display units due to their attractive flat panel feature. Their unique structure, combined with their performance, has made them popular across the globe.

CRT display panels or monitors are big, space-consuming things. Their old-fashioned cabinets are around twenty inches deep, and they occupy more space than their flat-screen competitors. The liquid crystals and transistors do all the work in a flat-screen monitor, which minimizes the need for a big case. Hence, when space is at a premium, the CRT monitor is bound to lose out to the flat-screen monitor.

Flat monitors can also serve as a replacement for your regular television. Although you can watch TV using your old CRT, you will have to install a TV tuner video card, and even then the quality of the picture is not that great. Besides, it can be bothersome to update your computer when you have a more convenient and attractive option available. Flat monitors are brighter and users find it easier to see the text on them.

Flat monitors consume less electricity and will definitely contribute towards savings in electricity bills. However, flat-screen monitors are still more expensive that CRT monitors. While prices have lowered considerably, they still have a long way to go before they can fully compete with the reasonably priced CRT monitors.

External Sound Cards

External sound cards pretty much work in the same principle as your internal audio card or the one that’s on the motherboard. They are capable of producing audio from the data transmitted by the processor. The only difference is they are mobile. An external audio card just needs to be connected via a USB cable for it to work.

An external audio card would come in handy when you want to have better audio quality for your laptop but space and temperature conditions doesn’t allow high-end internal sound cards. The good thing about getting a separate audio card is that this one is mobile. You can transfer it to another computer. Just make sure that you get one that has a plug and play functionality.

Just like with your internal sound card, you need to assess what you use the computer for before getting an external sound card. Usually, this audio card is used by movie buffs or music enthusiasts so if you’re the type who only does simple word processing on the computer, you may want to rethink getting your own external audio card.

External sound cards typically get connected via a USB port in the computer so it goes without saying that you need to make sure that your computer has enough slots to accommodate your sound card as well as the other peripherals that you have. Another thing to keep in mind is that you also need to make sure that your computer is properly updated. Just like the internal sound card, you may need to upgrade on your system so the external audio card can produce good audio quality.

Building Computers

You can save the thirty percent or more that custom shops charge for labor by building your own gaming rig. It can easily mean $300 that stays in your pocket to be used later for games, a better monitor, or whatever you want.

Is it hard to build a gamer?

The answer is “no”. Often, I’ve told people “There are only eleven major parts in a computer. Most of them snap together, or plug in. If you can connect just eleven items, then you can build a computer.”

Of course, a gamer does have differences from a general purpose computer. That’s what makes it a gamer. But does that make it harder to build?

Let’s say you want to build a Crossfire system with two graphics cards. It isn’t any harder to plug two graphics cards into their slots than to install one. Nor is it more difficult to install a dual core CPU. The chip drops into a zero insertion force slot. Push the lever down and it’s clamped into place. That’s it. A dual core system goes together just like a single core.

How about a big, fast hard drive? Again, there’s nothing different about how it goes in. Four screws hold it to the chassis. There’s a ribbon cable that connects it to the motherboard, and a line running to the power supply. Four screws, two plugs, and the installation is done.

Does all the cabling worry you? Almost all of the cables and wires you’ll hook up have plugs that are “keyed”, meaning they can only be inserted one way. To put it bluntly, they’re idiot proof. You can’t turn a power plug upside down so that electricity goes to the wrong post. It won’t fit that way.

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The VPS hosting system is crafted in such a way that a VPS caters to a single client’s system and runs various applications on a particular machine it is designed for.

Dual Computer Monitors

All of Microsoft’s and Apple’s operating system versions released these days support the use of dual monitors. Using dual monitors, the user is able to ‘extend’ the display on one desktop onto the second display device. This means that when the different display devices are positioned next to each other, it provides the user with the illusion of being logically contiguous.

Depending on one’s luck, setting up dual monitors can be as simple as adding an extra video card and monitor and restarting the computer or turn out to be a task that makes the user want to pull out great tufts of hair in sheer frustration.

The first thing that will have to be done is the installation of a second video card, the one that is meant to support the extra monitor. This requires the computer’s motherboard to have an extra expansion slot, the availability of which can be determined by opening up the tower and checking. If available, the extra video card will have to be manually inserted into the slot. The monitor will then have to be plugged into this video card, and the computer should be restarted.

Depending on the card, drivers may or may not have to be manually installed by the user, since Windows has built-in drivers that support certain video cards. Once the drivers have been installed, there are settings that have to be adjusted to enable display on the second monitor. This is done in the Display Properties window, under the Settings tab.

There are a variety of dual monitor cards available on the market, with prices usually starting at around $100. Dual monitor users swear by the fact that once a person uses a dual monitor system; they will never revert back to a single monitor, no matter what the case.

OLED

OLED (Organic.Light.Emitting.Diode) is a new display technology that promises to deliver thin, power efficient and bright displays. OLEDs (already popular in MP3 players and cell phones) have amazing potential – thin TVs, flexible displays, transparent monitors, white-bulb replacement, and more.

LCD works by having a backlight (white light) source, and then filtering this source to make colors. OLEDs however work by emitting color light. This has several advantages. It allows to make simpler and thus thinner and cheaper displays. It also means that OLEDs require less power. Think that when you have a screen that is completely black (but turned on), LCD will still require the whole white backlight to be emitted. With OLEDs, no energy is consumed in this stage! It is also possible to make flexible OLED displays, and even transparent ones, but this is obviously more challenging than a simple LCD-like display.

While OLEDs are heralded as the display technology of the future, they are already produced and used today. While making large panels is still a great challenge, smaller screens (up to 2″) are already produced in commercial quantities today. There are many MP3 players and cellular phones that use OLED displays. Companies such as Sony and Samsung use OLED displays in their leading models. The OLED market reached 500$ million in sales in 2005, and is expected to grow quickly in the coming years.

There are two main types of OLED screens – Passive Matrix (PMOLED) and Active Matrix (AMOLED). PMOLED displays are cheaper and easier to manufacture, but they have a limitation in resolution, size and refresh rate. Most OLEDs that are being made today are PMOLED. However several companies (including Samsung SDI and LG.Philips) have announced plans to begin producing AMOLED panels.

The future for large OLED panels is not so certain. The major limitation of OLED technology today is the lifetime, especially for the blue color. Progress is being made all the time, but the technology is not ready yet. Scaling the OLED screens is not an easy thing to do, either. Making a large panel (for TV or computer screen) is far from simple. While prototypes have been showed, it will take several years before we’ll be able to buy an OLED television.

OLEDs actually make it possible to create screens that are flexible and/or transparent. The possibilities of this kind of displays are almost endless. Think about car windshield-embedded transparent displays, or rollable mobile TV. This technology is still at an early stage, but already companies are showing prototype and design sketches.

One of the areas that seem most promising for OLEDs is white lighting. Many companies are hoping that OLEDs will enable very efficient light sources. With today’s high energy costs, and the drive for efficiency, there is a lot of money in white-light research, and OLEDs are seen as one of the best future technologies. OLEDs will also enable unimaginable designs, because of their thin and flexible nature.