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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Wednesday, 03 January 2007 |
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The sealed lead acid battery has an advantageous feature of excellent liquid leakage proofness, requiring no water supplement and causing less self-discharge. Sealed lead-acid batteries in which oxygen gas generated at the positive electrode during charging of the battery is absorbed by the negative electrode are available in two types, a retainer type and a gel type. Sealed lead-acid batteries have been employed in a variety of stand-by power applications to provide a power source when the main power source becomes inoperable. A valve regulated lead acid (VRLA) battery comprises separators and plates stacked within a sealed container, in which an electrolyte in a cell is retained in the pores of the separators and both of positive and negative electrode plates so as not to flow. |
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Wednesday, 03 January 2007 |
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A computer network is a collection of interconnected computing devices that exchange data and share resources. A router connects computer networks having different lower hierarchy structures. The router transmits packet data through an optimal path established in connection with a routing table, as well as connects the received packet to another network or a target node of its own network. An IP router using an optical switch fabric takes in internet protocol packets and routes them through an optical switch to various destination ports of the switch. The router stores a routing table therein, and checks the IP address of each packet transmitted from another node by referring to the routing table, to determine the next destination or node of the packet and sends out the packet. |
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Tuesday, 02 January 2007 |
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Schottky diodes are semiconductor devices having a metal-semiconductor transition as their basic structure and whose basic electronic properties are defined by this transition. A Schottky diode comprises a semiconductor substrate and a metal contact layer deposited on the substrate to form a Schottky barrier at the metal-semiconductor interface. Schottky diodes are widely used in integrated circuits in applications such as radiation detectors, imaging devices, and wired and wireless communications products. A Schottky diode is used in microwave circuits as a mixer where a local oscillator waveform is combined with an incoming signal to produce a difference frequency (intermediate frequency). Most Schottky diodes are silicon-based, vertical conduction devices. |
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Tuesday, 02 January 2007 |
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Dimmer switches are used for varying the electric power applied to an electric load such as an electric light. Dimming control systems utilizing self contained, interchangeable dimmer modules are commonly used in theater, television, and architectural lighting applications. Dimmer switches are well known devices for varying the light intensity of an illuminating device usually between a fully on state and a fully off state. Rather than use a variable resistor type rheostat which wastes power and generates heat at low illumination levels, modern dimmer switches employ phase regulation. A phase control circuit renders a solid state switch conductive at a point during a half cycle of the sinusoid. Switching operations are performed by the SCRs in a phase angle dimmer at a low frequency. |
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Thursday, 21 December 2006 |
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Key telephone systems are phone switching system for relaying telephone communication between extensions or between an extension and an outside phone. A basic key telephone system includes a number of key telephone sets connected through a central control unit to each of a number of key telephone sets. Each key telephone includes a number of subscriber lines connected thereto. The main unit containing a plurality of key telephones is connected to an office line or a public switched telephone network. Data including speech data and control data are transmitted between the key telephone and the main unit in a predetermined data transmission scheme which depends on the system. A digital key telephone system include digital key telephones connected to the extension lines of the main unit. |
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Wednesday, 20 December 2006 |
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In a conventional method of recording, reproducing, and editing audio signals, analog audio signals are magnetically recorded on a magnetic tape, and the recorded audio signals are reproduced and edited. With the progress of digital technique, processing of a large capacity of data is enabled and digital recording is adopted for recording various signals. Digital audio recorders have been developed in which the audio information is stored as digital data in a solid state memory. A digital audio recorder uses a memory card as a record medium and employs a data compressing method which allows data to be restored in a high quality for recording/reproducing. An audio signal compressed with a variety of compression formats, represented by MP3, is also often replayed with computers. |
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Wednesday, 20 December 2006 |
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An optical mouse provides precise detection of a movement of user's hand and its movement, as compared with a conventional mechanical ball mouse. In optical mice, a light emitted from a light source is reflected by an operating surface, and the reflected light passes through a lens to be inputted to an image sensor made of semiconductor process. The optical mouse determines its own position relative to the surface by comparing the differences between consecutive images. The optical mouse measures a quantity of the light projected to the image sensor and stores a pattern made by comparing a difference between pixels of the image sensor. The mouse generates cursor signals corresponding to its movement, converts the signals to electrical signals, and transmits the electric signal to the computer. |
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Electronics Information
