Portal:Electronics
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Culture · Geography · Health · History · Mathematics · Natural sciences · Philosophy · Religion · Society · Technology The field of electronics comprises the study and use of systems that operate by controlling the flow of electrons (or other charge carriers) in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is an integral technique in the field of electronics engineering and is equally important in hardware design for computer engineering. All applications of electronics involve the transmission of either information or power. Most deal only with information. Consumer electronics are electronic devices intended for everyday use by people. Consumer electronics usually find applications in entertainment, communications and office productivity. Consumer electronics are manufactured throughout the world, although there is a particularly high concentration of manufacturing activity in the Far East. One overriding characteristic of all consumer electronic products is the trend of ever-falling prices. This is driven by gains in manufacturing efficiency and automation, coupled with improvements in semiconductor design.  Georg Simon Ohm, (March 16, 1789 - July 6, 1854) a German physicist, was born in Erlangen and educated at the university there. His most important finding was Ohm's Law, which he first published in his pamphlet Die galvanische Kette mathematisch bearbeitet, in 1827. This work, the germ of which had appeared during the two preceding years in the journals of Schweigger and Poggendorff, has exerted an important influence on the development of the theory and applications of electric current. Ohm's name was adopted as the SI unit of resistance, the ohm (symbol Ω).  Credit: NASA System diagram of the Goodyear Aerospace Massively Parallel Processor.  Credit: commons:User:Peo Ray traced image of two jack plugs, one mono, the other stereo. HP Labs announces the creation of a Memristor, the fourth basic element of electronic circuits with the Resistor, Capacitor, and Inductor. More...  On the third day of the 2007 Taipei IT Month in Taiwan yesterday, notebook computers and desktop computers built with AMD's Phenom processor and Intel Penryn processor openly battled for the consumer-market after each company launched their quad core processors. More... The new South Pole Telescope has recently collected its first light in a long-term project to learn about the nature of dark energy. More... A Sea Launch Zenit 3SL rocket has exploded on its Ocean Odyssey launch pad, just seconds before it was scheduled to launch. The engine had just been started when the rocket appeared to fall downwards, and was engulfed in a fireball. More...  The primary camera on the Hubble Space Telescope has shut down and is likely to only be restored to partial functionality, according to reports from NASA. More... Electronics - Consumer electronics - Engineering - Manufacturing - Symbols - Terms - Units - Waste Theory: Ampère's law - Coulomb's law - Frequency - Hall effect - Joule's laws - Kirchhoff's laws - Millman's Theorem - Moore's Law - Norton's theorem - Ohm's law - Peukert's law - Resistance - Thévenin's theorem-superposition - Wavelength Components: Antenna - Capacitor - Connectors - Diode - Fuse - Ground - Inductor - Integrated circuit - LCD - Magnetron - Phased array - Printed circuit board - Resistor - Thermocouple - Transformer - Transistor - Switch - Wire Circuits: AC - Bridge - Designs - Diagrams - DC - Impedance - Load - Series and parallel - Voltage divider - Voltage drop Fields: Avionics - Computer systems - Control systems - Electromechanics - Microelectronics - Military - Optoelectronics - Power - Quantum electronics - Radio - Robotics - Semiconductors - Spintronics - Telecommunications Products: Cameras - Computers - Fiber optics - Lasers - Lights - Mobile phones - Printed circuit board - Radios - TVs  A scanner is a radio receiver that automatically tunes, or scans, two or more discrete frequencies. Generally, scanners cover the non-broadcast radio bands between 30 and 950 MHz using FM. Popular amongst hobbyists, reporters, corporate spies, criminals and lawyers, scanners allow chosen frequencies to be stored in memory banks to allow them to be monitored later and will only stop scanning when there is a signal strong enough to break the radio's squelch setting.
A bipolar junction transistor (BJT) is a type of transistor. It is a three-terminal device constructed of doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes. Although a small part of the base–emitter current is carried by the majority carriers, the main current is carried by minority carriers in the base, and so BJTs are classified as 'minority-carrier' devices. The bipolar (point-contact) transistor was invented in December 1947 at the Bell Telephone Laboratories by John Bardeen and Walter Brattain under the direction of William Shockley. The junction version was invented by Shockley in 1951. |
