March 26th, 2010
A lap top is a portable personal Computer. It is so called as it is small enough to fit into a person’s lap. Laptops have most of the features of a desktop like Keyboard, screen, touch pad and batteries. They are usually shaped like a large notebook.
They were initially intended for a niche market like military and internal revenue services. But now they are popular with the general public like students etc. In 2008, sales of laptops exceeded those of Desktops in the USA.
The advantages of Laptops are many:
Main advantage is portability. It means that the Laptops can be used anywhere, at home, in the office, while traveling, in lecture halls, coffee shops etc. Portability offers the following advantages:
- Achieving more: More work can be completed by Laptops. It can do work where it is not feasible by a desk top, like while traveling, or while resting in a university coffee shop in between lectures.
- Instantaneous work: Carrying a laptop computer provides immediate access to various personal files and other information. Getting immediate access to information helps in better collaboration between students and coworkers because a laptop can be used to present a solution anywhere at any time.
- Latest information: In case a person has more than one desk top PC, it becomes a problem to synchronize; changes in one are not automatically transferred to another. It needs to be physically transmitted like through a USB stick. But using a single lap top at both locations solves the problem as files are found in one location and are up to date.
- Connectivity: the latest broadband and WiFi connections enable the Laptops to be net connected wherever it is transported and enables internet based work at any place, at any time.
The next advantage of Laptops is their size.
· Laptops are much smaller than Desk tops. This is useful when there is a shortage of space like student dorms and small apartments. Lap tops can be folded and put away.
· They are easily accessible. Many of the drives, hard drive, memory etc on the Laptop are easily accessible in comparison to the desktop.
· Also, power consumption by laptops is much lower than that of desktops. A laptop uses 60-90 watts while a desk top consumes 100 to 800 watts. For more details please visit http://www.webelectronicsstore.com/computers/
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March 25th, 2010
Getting from one corner of a city to another is not usually an easy task with large amount of distraction and traffic to interfere in your attention.
Before GPS or Global Positioning System was invented, to travel to unknown areas required a map or stopping at different points to ask for directions. Both methods are fraught with problems. Reading a map while driving is not an easy task and you require the assistance of some one else to read out the directions.
Asking for directions can be frustrating with different people giving different advice on the way or if one person gives unclear instructions.
Fortunately the automotive GPS has been invented and it has made map reading and asking for directions much simpler. Gaining directions has been easier as it can be done through activated voice, pushing buttons, touching the screen or combining a number of these functions.
Maps giving the exact location appear on the screen while a computer generated voice can give directions. The only problem is to decide which GPS unit to buy.
The first consideration while buying a GPS unit is to consider its accuracy. One way to determine how accurate a GPS unit is by considering how many channels the GPS unit has. This is because more channels means that there are more satellites that it communicates with it and resulting in more coverage.
One other way to determine accuracy is by determining how its antenna is designed. Ensure that antenna is placed in a spot on the unit where it can freely stand.
The next consideration with respect to GPS is its size. Some GPS units are not portable. Some others are small enough to be portable. There are some as small as a hard cover book.
The third consideration of a GPS unit is the interface of the unit. Expensive versions of GPS units will consist of voice activation and also touch screens while cheaper ones are enabled through a set of buttons. Use of buttons is convenient only if there is another person in the car. But if only the driver ahs to operate the unit, it must be as Hands-free as possible. It is also vital to get an Automotive GPS unit that can give directions through a computer generated voice. For more details visit http://www.webelectronicsstore.com/gps/
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March 16th, 2010
Whether placed along a flattened screen or in a projector’s centre, the technology behind all LCD’s is the same. A system of Thin Film Transistors (TFT’s) supply voltage to cells filled with liquid crystal placed between two glass sheets.
When subject to electric current the crystals untwist to a perfect degree to filter white light emitted by a lamp placed behind the screen, in the case of Flat panel TV’s or trough a small LCD chip projection , in the case of Projection T.V.
LCD monitors produce color through a subtraction process. They block away color wavelengths of particular color for white light spectrum until they are left with the correct color. The light’s intensity allowed to transmit via this liquid crystal matrix enables LCD TVs to display a wide variety of colors.
LED TV’s are a new type of LCD’s. The LED’s panel is still that of an LCD and operates with the same crystal technology. The difference is the backlight changing from fluorescent to that based on LED (light emitting diode).
Regarding color performance, LCD TV’s reproduce colors by manipulating light waves and subtracting colors from white light. This is basically a difficult way to maintain accuracy and vibrancy of color. LCD’s however produce a brighter picture. It will suit a room with lots of ambient light.
LCD TV makers have done a great deal to improve the viewing angles of their displays. The best LCD TV’s have around 120 degree viewing angles.
But LCD TV’s suffer from trailer effects when individual pixels are slightly out of sync with image on screen. During fast moving scenes a discerning eye can detect this motion lag. This applies to both fluorescent backlit LCD’s and LED backed LCD’s.
LCD TV’s are also preferred on aero planes. They are not affected by increase or decrease in air pressure. They perform consistently regardless of the altitude they are operated in.
Regarding longevity, there is little to wear out in an LCD TV except for backlighting. But the fluorescent backlighting in LCD’s cannot be replaced cost effectively. LED backlit LCD’s last for a long time.
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January 20th, 2010
There are many components of a Car audio system. These together determine the quality of the sound and music produced by the Car Audio.
But first there is the issue of Installation. There are two types of installation done by people. General Audio installation consists of usually a head unit, one or two amplifiers, splits, and either a pair of 6 x 9 speakers or a sub woofer to take care of bass. The other installation is for competition Sound-offs. These are also named as Decibels (DB).The purpose of competition is to get the highest DB through a sensitive microphone installed at an exact point in all cars.
Then come the components of the audio system.
First is the Head Unit-It is the primary control system for the car audio unit and is installed in the dash panel between the driver and the passenger. It contains various media devices such as radio receiver/ tuner, a tape player, a CD player or an MP3 player
Next come the speakers. They are similar to other loud speakers but adapted to mobile usage. They are multi axially mounted and come in non circular cone shapes for ergonomic design. In modern design speakers are placed at the dash or front deck, the rear deck, the kick panel or the doors.
Amplifier: A dedicated amplifier separated from other parts of the music systems in car audio. Most head units have an amplifier. They convert low power signals received by car speakers to high power signals thus improving their quality of sound and loudness. Most amplifiers work with a Pre-amp which delivers initial boost to low power signals before sending them to the amplifier.
Sub woofers: Play an important role in car audio. Reproduce sound in the lowest frequencies that are audible and that which produces a deep bass that makes the car vibrate. It makes sound come alive better than a standard speaker. It is usually installed at the centre of the trunk of the car to evenly distribute sound.
Capacitors: They are used to store energy which is drawn up by the amplifier. They cater to the short burst of electrical demands of a car audio system that have exceeded the electrical capabilities of the vehicle.
All these components together make for a fully functional Car Audio System
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January 15th, 2010
Unlocked cell phones are those that are not tied down to a carrier’s network. It will typically work with a variety of service providers.
Most smart phones and cell phones are tied to a single service provider like Verizon wireless, Sprint, AT&T or T-Mobile. Even if you buy the phone from anywhere, you may still have to stick with a particular carrier. For example, if you buy iPhone from any store, you will still have to operate with AT&T’service. Such phones are called as locked phones.
For many reasons, purchasing a locked phone makes sense. The service provider may provide attractive discounts and deals to the phone locked into their service.
But many others may not like being tied down to a single network as in the case of locked phones. For people traveling abroad frequently it does not make sense to carry the same network while traveling as it will cost the earth to make a roaming call. In such a case they would prefer to access local networks while staying abroad and in this case, unlocked cell phones make better sense.
Some people may also not like to sign lengthy contracts with service providers as they are on the move all the time. Unlocked cell phones are better suited to their needs.
So you might consider trying to unlock your cell phone. Some smart phones and cell phones can be unlocked but they require external help. Once you have bought a locked cell phone it is in the interest of the service provider to keep it locked so they make unlocking a difficult process.
Some phones can be unlocked by altering their software but others may require tweaking their hardware. You can ask your service provider to unlock your phone but it is less likely that they will oblige especially if you are still under contract. Now the alternative is to ask a third party to unlock it for you typically for a small fee. But if your phone gets damaged they are under no obligation to replace it.
Take note that it does not make sense to unlock your phone until the present contract period with an existing service provider is completed or you will end up paying for whatever service you do not use.
Unlocked Cell Phones are useful to those who like to change service providers often and those who travel most of the time.
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January 10th, 2010
Camcorders are video cameras that are portable and can record images and sound. Recording is done in some media, digital or tape based. They have existed since the 1980’s with technological changes happening in the 2000’s.
The earliest camcorders used to record to either VHS or Betamax tapes that allowed for convenient playback in video players. They were bulky but quite popular to record family events
In the late 1980’s the camcorders shrank in size. VHS-C tapes were developed which were very small in size but could hold only 40 minute of video. The second innovation was 8 mm tapes. They were much smaller in size than VHS . Though it could support 2 hours of video.
By late 1990’s, most camcorders had shifted to a digital format called Mini DV. The popularity of Mini DV was because of its affordable price tag, excellent quality of video and easy to edit features. The video can be copied to a DVD. The size is much smaller than conventional VHS tapes. A disadvantage is that you cannot locate a particular point during the video, not even by forwarding nor rewinding.
Digital8 camcorders are a different digital alternative to traditional types. They do not have the same utilities as Mini DV technology but are capable of running 8mm tapes. So it is a good way to upgrade from an 8mm setup already in place.
With rising affordability and portability, new varieties of digital camcorders have become popular.
DVD camcorders consist of digital based camcorders that use an in built DVD recorder to record footage directly to DVD media. They have become immensely popular due to affordability and portability.
Flash Camcorders use flash memory to store video. However this memory becomes very small with any thing exceeding 2 GB being ridiculously expensive. So these have not caught up in sales.
Hard drive based machines use internal hard drive to save video. They enjoy the benefit of not using external media and allows for direct copying of video to a hard disk without the intervention of a computer. But for long recordings, this poses a problem as once the hard drive is exhausted, you will require a P.C. to save the initial footage to shoot the latter footage.
The latest in the market are the HDV Camcorders. It produces best quality High definition Video. These are the most expensive models today.
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December 31st, 2009
If you have a passion for electronics and would like to start an online electronics store selling leading electronics gadgets like audio, TV./ radio, computer hardware, projectors etc, you have a number of options on the net.
You can popularize your items and let clients know that they can place orders to custom design electronic products from start to finish. You may even fashion your USP as low design costs, fast service and quality products.
You can set up an online catalogue of all your products in your electronic store. You can include a brief description regarding the functioning of each product so that even a novice can grasp the exact way to operate the electronic product.
Online electronic store is gaining popularity as it maintains low costs as well as wide choice of electronic items on display. Most local dealers have a limited variety of products to display to the customer physically. The time is ripe for e- electronic stores which have a wide variety of products to sell.
You can set up an online electronic store as soon as your payment to the host website is paid. Soon after purchase it can be processed and started. The online electronics store would display popular electronic items in deferent categories.
One big advantage of the electronic store is that it would be open 24 hours a day, 7 days a week. You can make money throughout the year, month and day. Also there is neither need to hire employees nor any need to maintain warehouses.
Every order placed is safe and secure. It is encrypted with software that protects your personal information from others. This gives confidence to consumers for buying from you.
There is no need to keep an inventory. The customer’s orders are serviced directly from the manufacturer’s warehouse.
Thus Electronics Stores are good to be made online and also great to buy electronics products from due to the ease of making choice and a simple buying transaction.
Tags: Electronics Store
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December 30th, 2009
Fax machines have become integral to all kinds of business small or large. Home office fax machines have become indispensable in home offices.
There are two kinds of basic fax machines: Ink Jet and Laser. Ink jet uses ink droplets to transfer images and has capacity of 400 pages per cartridge. Laser uses Light emitting diodes to transfer images and has capacity of 5000 pages per cartridge.
The trend is now to have all-in-one fax machines. This implies printer, copier, fax and scanner all in one machine. The advantage is that you have all the facilities of printing, copying, faxing and scanning in one machine. This avoids the clutter of individual machines especially when you have a premium on space in your home office. It also eliminates the need for multiple electric points. There is an amalgamation of many features in one machine.
The disadvantages are also related to the all-in-one feature. For example if printer is damaged, your function to print incoming faxes is spoilt. You can also lose all the functions at once if you have a problem related to all of them at once like cutting off of power supply.
Once you have selected your fax machine (laser/ ink jet/multipurpose), you can consider the following features:
- Controls must be easy to use and have good layout.
- Size must be adequate to print large documents and books. It must occupy minimum size on desk or stand.
- It must have a resolution of at least 300×300 dpi.
- Ink cartridge must not be costly.
- It must be network/ wireless capable
- Must have a paper tray capable of handling 100 pages minimum
- Speed must be adequate. The Page transmission speed varies according to the models. High volumes require faster speeds.
- There must be minimum sound. Look for noiseless operation.
Choosing the best home office fax machines is always a matter of personal choice and taste. You should weigh the advantages and disadvantages of each fax machine as you purchase for the home office. For instance, multi-function fax machines will k help to conserve space and electricity in a home office. An ink jet fax machine would be cheap while a Laser Printer will be cost effective in the long run in terms of pages per cartridge.
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December 29th, 2009
Computers are an integral part of our lives today. They have many hundreds of applications Basically the speed of a computer is unparalleled. It has changed the way we work, play, communicate and create.
Some of the advantages of computers are as follows:
Computers help in the sphere of writing.They have utilities like editing, copy, pasting as well as spell check and thesaurus. You can proof read a document very fast using spell check and you need not open a dictionary to check words. Reorganizing matter is made easy by editing, cut, copy and paste. Also you can print, save and create documents as you wish.
One of the biggest uses of computers is the facility of the Internet. Internet is a world wide network of computers connected to each other. The World Wide Web is an enormous source of information that can be accessed via the internet.
E-mail is electronic mail- a system of mailing via the internet which helps to create, store and forward mails. One can manipulate text messages as well as audio-visual material. One can upload and download messages and video as well as indulge in online chatting. E-mails and online chatting are much cheaper compared to telephonic conversations. There are also many games available and Online gaming is a popular activity. Also there are a number of uses of the internet like reading news, weather, consulting for advice on a variety of topics, purchasing objects, seeking employment, doing research on disease and medicine, paying taxes, making travel and hotel bookings etc.
Computers are also used for training and education purposes. Computers have become a learning aid for students. Many universities offer online degrees. Online education is a flexible and convenient form of education. Computers are also used by organizations to train their staff. The latest trend is to conduct online examinations.
Then there are miscellaneous uses of computers. It is use in Flight Simulation: in training pilots without wasting costly planes. It is used in automated industrial monitoring and control. It is used in geoseismic surveying- to capture acoustic reflections from a survey boat and to perform ultra specific navigation. In medical industry, computers are part of electrocardiograph machines etc. In the entertainment field, your DVD Player, cable box, TV and CD player all consist of something related to computers.
Tags: Computers
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December 28th, 2009
The Global Positioning System (GPS) is a navigation system consisting of a network of 24 satellites. These satellites are placed into orbit by US department of defense. It was intended basically for military use though in the 1980’s it was allowed for civilian use.
The GPS works 24 hours a day, everywhere in the world, in any weather conditions. One can use the GPS without any charge.
GPS satellites orbits the earth twice in a day in a set orbit and are engaged in transmitting signals to the earth. Receivers use this transmitted information to decide the location of the person. Basically it calculates the difference between the time the signal is sent by a satellite with that taken to receive it. The difference in time reveals how distant the satellite is. Next the distance from some more satellites is measured and the receiver is able to determine the exact location of the user.
A GPS recover must be attached to the signal of minimum 3 satellites to determine 2 D position (longitude and latitude) and keep track of his movement. With 4 and more satellites, a 3 D position can be ascertained (altitude also). Once location is established other data like speed, distance etc can be calculated.
GPS is free for everyone. Anyone with a receiver will be provided location and time. The GPS consists of three sections: Satellites circling the earth, earthly monitoring and control stations and GPS receivers.
One can purchase GPS receivers readily available in the market. With these receivers one can correctly place where one is and easily proceed to your destination whether by driving, boating or flying.
GPS has evolved to a main transportation system, providing direction for ground, aviation and maritime movements. Emergency services rely on GPS for timing and location services to help support rescue missions.
Accurate timing provided by GPS helps in operations such as mobile phone operations, power grids control and banking operations. Farmers, scientists and many others perform their functions efficiently using GPS signals.
There are some factors that degrade GPS signals and affect accuracy of their readings: They are Ionosphere and Troposphere delays, receiver clock errors, orbital errors and purposeful degradation by US department of defense for defense purposes.
Tags: GPS
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