Provides information and reviews of electronics and electrical products, including computers, audio and video electronics, fiber optics, electronic components, RF and microwave electronics, security and alarm products, sensors and detectors, lightings and lamps, digital cameras, camcorders, cell phone, battery, printers and copiers, power supplies, optoelectronics, cables and connectors, and satellite communication products.
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Friday, 15 September 2006 |
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A membrane switch, also known as tactile or pressure sensitive switch, is an electrical switch that is touch activated to make or break the electrical connection of a particular switch element. Membrane switches employ a pair of stacked flexible membranes having opposed contacts printed on their facing surfaces. Each of the membranes has electrical contacts printed on their opposing faces at button locations that are brought into electrical conduction when the membrane is flexed. A membrane switch has an array of switch cells connected to appropriate drive and sense circuitry that enable the detection of a specific cell that is activated. Membrane switches or touch contact switches have achieved phenomenal success over the last decade due to their simplicity, reliability and very low cost. |
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Friday, 15 September 2006 |
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A relay is an electrical switch that opens and closes automatically under control of another electrical circuit. Electromechanical relays are electromagnetic devices in which current flowing through a coil actuates a pair of electrical contacts. Electromechanical switching devices use solenoid driven means to transfer electromechanical contacts to apply a source voltage to a load. A solid state relay provides isolation between a control circuit and a switched circuit and may replace an electromechanical device such as a reed relay. Solid state relays have all solid state components, and do not require any moving parts. Solid state relays have advantages over electromechanical relays, such as increased lifetime, decreased electrical noise, compatibility with digital circuitry, and resistance to corrosion. |
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Friday, 15 September 2006 |
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Two-way radios, or acknowledge-back paging systems, generally broadcast directly from one communications device (typically a portable radio) to another. Two-way radio communications are generally carried out using an associated pair of frequencies within one or more bands. Two-way systems provide confirmation of message delivery, as well as automatic retry upon a failure of a message delivery attempt. Portable two-way radios are used to communicate with extremely complicated communication systems which automatically switch operating frequencies and signalling protocols. Trunked radio systems utilize a central control unit to organize and control the operation of the entire system. Portable two-way radios are becoming more advanced in both form and function. |
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Thursday, 14 September 2006 |
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Speakers are typical peripheral devices for a personal computer. With the growing popularity of sound-based multimedia systems, an increasing number of computers and computer peripheral devices are being provided with speakers to accommodate the multimedia systems' sound requirements. Multimedia computer speaker systems typically include pairs of wide-band speakers mounted in separate housings with amplification electronics incorporated into one or both housings. Typical speakers can be positioned near or are incorporated into the computer monitor to deliver higher quality sound directly to the user. Some multimedia computers include four-channel audio subsystems, sometimes called surround sound systems, environmental audio systems, or multi-channel audio systems. |
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Thursday, 14 September 2006 |
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Computer systems typically employ a central processing unit (CPU), a display device, input devices, and memory for data storage. There are many different types of memory including random access memory (RAM), read only memory (ROM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), and flash memory. In a computer, non-volatile memory is used for long term storage of programs and data which seldom or never change, and volatile memory devices are used for the short-term storage of program instructions and data during the execution of a program. Flash memory devices are applicable for multiple operations of data writing, reading and erasing, and are used as non-volatile memory devices for personal computers and other electronic products. |
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Wednesday, 13 September 2006 |
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A plasma display device is a display device in which a voltage is applied to discharge cells containing a discharge gas consisting of a rare gas sealed in discharge spaces, and phosphor layers in the discharge are excited by UV rays generated based on glow discharge in the discharge gas, thereby achieving emission of light. Plasma display panels (PDP) are widely used for flat TV screens. A plasma display panel can be structurally grouped into a direct current (DC) type panel in which electrodes are exposed to discharge gas, and an alternate current (AC) type panel in which electrodes are covered with a dielectric film, and are not exposed to discharge gas. lasma display panels offer the advantages of thin structure, freedom from flicker, a high display contrast ratio, and rapid response speed. |
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Wednesday, 13 September 2006 |
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Amplifiers produce from an input signal, an output signal having an increased magnitude. Amplifiers are used in a variety of applications requiring small signal amplification. Modern wireless communication base stations transmit and receive radio frequency signals through the use of RF power amplifiers. An RF power amplifier is required to have linearity over the range of power operation and efficiency. Linearity is the ability to amplify without distortion while efficiency is the ability to convert DC to RF energy with minimal wasted power and heat generation. Amplifier output efficiency is defined as the ratio between the RF output power and the input (DC) power. RF power amplifiers are generally designed to provide maximum efficiency at the maximal output power. |
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Electronics Information
