As it sounds, a projection television, or more commonly a "rear-projection" TV work by projecting an image from behind the screen itself. Currently, there are three main types of technology used in rear-projection TV's: CRT, LCD, and DLP. Each uses a combination of projection devices, magnification lenses, mirrors, and screens to produce the image seen. However, each takes an alternate approach and each has its own sets of advantages and disadvantages. CRT CRT, or Cathode Ray Tube, technology is the most basic and has been around the longest of rear-projection Read More

The iPod Nano is one of Apple's many different music players. It was targeted to be a smaller, more portable iPod in comparison to the much bulkier iPod classic. Because of this, it does hold less music than the iPod Classic. However, as generations have gone–Apple is up to their fifth generation of the iPod Nano–the amount of songs that the Nano can hold has increased. On top of that, now users can add video to their iPod Nano. There are two models of the iPod Nano. The first is Read More

Unix / Linux Tutorial for Beginners A beginners guide to the Unix and Linux operating system. Eight simple tutorials which cover the basics of Unix / Linux commands. Linux Tutorial – Introduction A tutorial for Linux, a version of Unix that runs on ordinary personal computers. Internet Server Security and Configuration Tutorial This tutorial covers steps and tools which can be used to monitor and counteract hacker threats. Simply put, it is security risk management. Once a computer is connected to the Internet, you have to be concerned about the Read More

Unlike what some people imagine with laser tattoo removals and the myth of the skin being burned, it is actually a simple process of the laser making short pulses of intense light which passes through the top layers of the skin. This passing is basically absorbed by the tattoo pigments. The energy fragments the pigments into small pieces, which are later, naturally removed by the body’s immune system. Intense research in laser tattoo removing has been done to find the ideal frequency to remove the skin’s pigments, so that the Read More

This Ethernet cable can be used to connect a network interface card (NIC) to an Ethernet switch or hub. They transmit data using the Ethernet protocol. Ethernet cables have RJ-45 jacks on both ends, each with 8 pins (They look similar to telephone jacks, which use 4 pins or 6 pins). Equipment using an Ethernet cable is referred to as wired. The most popular Ethernet cable in current use, Category 5 or CAT5, supports both traditional and Fast Ethernet. The Category 5e (CAT5e) cable supports Gigabit Ethernet. This cable is Read More

TOSLINK or Toshiba – LINK is a connection standard for digital audio streams. It is a standard which uses fiber optic cables. The important feature of fiber optic cables is that they convert audio signals into light impulses as opposed to electric signals. TOSLINK cables usually transmit their signals as the red LED lights. The TOSLINK standard was first developed by Toshiba to provide connections in its CS players. It soon caught on and became the most popular connection format for audio signals. It is mainly used to connect CD Read More

Bolometers find and measure very small amounts of electromagnetic radiation. They are also referred to as actinic balances and measure electromagnetic radiation in radio, ultraviolet, and gamma ray forms. Since their first use, bolometers have been modified to detect other particles and to be used in physics experiments. Who Invented the Bolometer? Samuel Pierpont Langley invented the bolometer in the late 1800s. The first bolometer was used with a telescope in order to measure infrared radiation on the Moon and other astronomical objects. It consisted of two chambers with platinum Read More

VoIP (Voice over IP) includes communication protocols, technologies and techniques of transmission used for multimedia sessions and voice communication via IP networks. Other terms used synonymously with ‘Voice over IP’ include broadband phone, voice over broadband and Internet telephony.  How Does VoIP Work? VoIP calls require media channel setup, analog voice signal digitalization, encoding, packeting and transmission of IP packets via packet-switched network. On the receiving end, there will also be packet-decoding, conversion of analog signals to digital signals, and IP packets reception. VoIP uses audio codecs that encode speech Read More

The vi editor (visual editor) is one of the oldest and more popular text editors on computers running the Unix Operating System (OS). The vi editor can be used from any computer terminal interfacing with a computer running Unix, since the editor relies on the standard alphabet keys for specific commands. Since vi is not a WYSIWYG (What You See is What You Get) text editor, it does not provide the formatting capabilities word processors do for paragraph indentations, font, and line centering. New vi users need to learn the Read More

As its name suggests, a laser level is a leveler that illuminates a horizontal plane using a laser. It was originally developed by an inventor named Steve Orosz. The laser level works by being stationed on a tripod. This projector also has a rotatable head with a mirror, so that the laser beam can also sweep across the vertical axis. It is adjusted through the many visually interpretable level vials and the numerous screws that must be manually adjusted by a human for correction projection. Then, a staff with an Read More