LCD Projector

Description

An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern analog of the slide projector or overhead projector. To display images, LCD (liquid crystal display) projectors typically send light from a Metal halide lamp through a prism that separates light to three poly silicone panels -- one each for the red, green, and blue components of the video signal. As polarized light passes through the panels (combination of polarizer, LCD panel and analyzer), individual pixels can be opened to allow light to pass or closed to block the light. The combination of open and closed pixels can produce a wide range of colors and shades in the projected image.

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LCD Projector Diagram

Printer

Example image: Inkjet Printer (Epson Stylus C58)


Example image: Laser Printer (Okidata C7200)

Description

A computer printer, or more commonly a printer, produces a hard copy (permanent human-readable text and/or graphics) of documents stored in electronic form, usually on physical print media such as paper or transparencies. Many printers are primarily used as local computer peripherals, and are attached by a printer cable to a computer which serves as a document source. Some printers, commonly known as network printers, have built-in network interfaces (typically wireless or Ethernet), and can serve as a hardcopy device for any user on the network. Individual printers are often designed to support both local and network connected users at the same time.

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Inkjet printer cartridge


Dot matrix printer

Speaker

Example image: Computer speaker (LOGITECH X-540 5.1)


Example image: Computer speaker (Maxintec SPE-128)

Description

Computer speakers, or multimedia speakers, are external speakers, commonly equipped with a low-power internal amplifier. The standard audio connection is a 3.5mm (1/8 inch) stereo jack plug often colour-coded lime green (following the PC 99 standard) for computer sound cards.A plug and socket for a two-wire (signal and ground) coaxial cable that is widely used to connect analog audio and video components. Also called a "phono connector," rows of RCA sockets are found on the backs of stereo amplifiers and numerous A/V products. The prong is 1/8" thick by 5/16" long. A few use an RCA connector for input. There are also USB speakers which are powered from the 5 volts at 200 milliamps provided by the USB port, allowing about half a watt of output power.

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Speaker diagram

Headset

Example image: Headset

Example image: Headset

Description

A headset is a headphone combined with a microphone. Used in call centers and by people in telephone-intensive jobs, headsets provide the equivalent functionality of a telephone handset with hands-free operation. Many people use headsets at the computer so they can converse and type comfortably. Headsets typically have only one speaker like a telephone, but also come with speakers for both ears.

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Bluetooth headset (no cable)