Do you have electrical tools like computers or television, etc in your home? If you have it, it seems you need to pay attention to the speakers of them, book shelf speakers actually, and why is it so? Yes, the speakers is important actually to make the sound of your computer better that the usual. Finding the best speakers for them is not easy. (more…)
By: Dean Forster
You might just be at that point, where the small, wired home network you created a few months ago just is not doing it for you anymore and you want to extend it with a wireless network. Of course, you might as well be at that point, where you want to build a completely new network. Whichever the reason may be, the problem is the same – you need to know exactly how to do a wireless network installation.
Most of the time, you will find it necessary to install a wireless router. Now, you will only need to install one of these if you either are building your first home network or simply want to keep the wireless network installation at the simplest level as possible. Remember to install the router in a somewhat central location in your home so this way all receivers will be almost in the same line of sight. You see, with wireless internet, the speed depends on the distance from the router to the receiver. All you have to do now is connect your router to a power source, and of course an Internet source. Nowadays many routers support broadband modems and even dial-up connections. Still, when you buy a router make sure that it has an RS-232 serial port if you need the dial-up connection, because otherwise you will find yourself having a useless router. Last, but not least, you can also connect a wired router (called a switch or a hub) because wireless routers generally do contain built-in access points.
Now choose the name of your network. Often with Wi-Fi the network names are generically called SSID. Of course, this SSID has to be identical with all computers that are sharing the same wireless router. For your own protection, it is recommended that no matter what name your router manufacturer set to change it to something else. In order to find a network name for your router all you have to do is consult the product documentation. Finally, read the documentation to find out how to handle WEP security and also how to turn on firewall features and how to set other options.
Wireless Access Points
One wireless type network connection is supported by only one access point. It is very important to remember this further on. It is recommended to use this type of access point only if you indeed need the features that only a wireless router can provide and also you want to have more than three or four computers around the house that will be connected to the internet. You can read more at http://www.howtosetupwirelessnetwork.com
The positioning rule is the same as with wireless routers – access points have to be placed in a central location so that all receivers will be in the same line of sight. Plug in the power cord and if necessary the dial-up internet connection as well. Now cable the access points to your hub or switch. In this case, you will not have to configure any firewalls at all, yet you will still have to set a network name and enable the WEP function.
Giving these two options of installing a wireless network in your house, from this point on, all you have to do is install them in your own operating system and you’re good to go.
For more information on successfully installing and configuring a Wireless Network Set Up visit => http://www.howtosetupwirelessnetwork.com
By: Roberto Sedycias
Liquid Crystal display or LCD monitor is a thin and flat device for display. It is made by large number of color or monochromatic pixels which are arrayed in way of a light source or a reflector. It uses very small amount of electric power and hence is used often in battery powered electronic devices. The technology used is very much dissimilar to CRT technology which is used by many desktop monitors. It was used only on notebook computers for a very long time. Only recently they have been offered as an alternative to CRT monitors. They take up very less desk space and are much lighter than the CRT monitors. But they are also quite expensive.
Each pixel of LCD monitor display has a layer of aligned molecules between two electrodes which are transparent and two polarizing filters. Because there is no liquid crystal between the aligned polarizing filters, light which has passed through the first filter will be blocked by the second polarizer. The surface which is in contact with the crystal is treated to align it in particular direction. The direction of alignment is defined by direction of rubbing.
Resolution, in terms of horizontal and vertical size expressed in pixels, is native supported for the best display effects. This is one of the things that sets LCD monitor apart. Dot Pitch is defined as the distance between two adjacent pixels. It is the minimum for sharper image. Each pixel is divided into three cells, or sub pixels. These are colored red, green and blue. Each sub pixel can be controlled independently for millions of combinations and hence colors. Older CRT monitors use phosphors for sub pixel structure. The analog electron beam though does not hit the exact sub pixel.
Color components can be arrayed in various geometries, depending on how the monitor is to be used. If the software being used knows the geometry, it can be used to increase the apparent number of pixels using sub pixel rendering. This kind of technique is often used in text anti-aliasing. LCDs which are used in digital watches and calculators have separate contact for each segment. Thus an external dedicated circuit charges each segment individually. This is not possible if the number of elements increases.
Small monochrome displays like the ones used in Personal Organizers or in older laptops have passive matrix like structure and employ super twisted nematic or double layer STN technology. Here, each row or each column has a single electrical circuit and the pixels are hence addressed according to rows and columns. But as the number of pixels increases, the response time decreases and the technique no longer remains feasible.
Color displays used in modern LCD monitors and televisions use active matrix structure. An array of thin film transistors (TFT) is added. Each pixel has a dedicated transistor. Active Matrix display looks brighter and sharper than passive matrix display of similar size and has better response time.
LCD technology has some critical drawbacks too. Resolution of a CRT monitor can be changed without introduction of any new artifact. But LCDs can produce only their native resolution and non native resolutions are achieved by scaling. The blacks of LCDs are actually grey because of presence of a light source. This results in lower contrast ratio when compared to CRTs. LCDs with cheaper parts cannot display as many colors plasma or CRT counterparts.
Also, LCD display has longer response time when compared to Plasma or CRT counterparts. Input lag is also present and the viewing angle is limited. In spite of these drawbacks, LCD display is quickly gaining prominence.
This article can also be accessed in portuguese language from the Article section of page www.polomercantil.com.br/monitor-lcd.php Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br
