An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices. Common examples of signals generated by oscillators include signals broadcast by radio and television transmitters, clock signals that regulate computers and quartz clocks, and the sounds produced by electronic beepers and video games.
In electronics and control system theory, loop gain is the sum of the gain, expressed as a ratio or in decibels, around a feedback loop. Feedback loops are widely used in electronics in amplifiers and oscillators, and more generally in both electronic and nonelectronic industrial control systems to control industrial plant and equipment. The concept is also used in biology. In a feedback loop, the output of a device, process or plant is sampled and applied to alter the input, to better control the output. The loop gain, along with the related concept of loop phase shift, determines the behavior of the device, and particularly whether the output is stable, or unstable, which can result in oscillation. The importance of loop gain as a parameter for characterizing electronic feedback amplifiers was first recognized by Heinrich Barkhausen in 1921, and was developed further by Hendrik Wade Bode and Harry Nyquist at Bell Labs in the 1930s.
A surname, family name, or last name is the portion of a personal name that indicates a person's family. Depending on the culture, all members of a family unit may have identical surnames or there may be variations based on the cultural rules.
Metaphorically, a snowball effect is a process that starts from an initial state of small significance and builds upon itself, becoming larger, and also perhaps potentially dangerous or disastrous, though it might be beneficial instead. This is a cliché in cartoons and modern theatrics and it is also used in psychology.
Porta Westfalica is a town in the district of Minden-Lübbecke, in North Rhine-Westphalia, Germany.
A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier for high radio frequencies, from UHF up into the microwave range. Low-power klystrons are used as oscillators in terrestrial microwave relay communications links, while high-power klystrons are used as output tubes in UHF television transmitters, satellite communication, radar transmitters, and to generate the drive power for modern particle accelerators.
Vienna has been an important center of musical innovation. 18th- and 19th-century composers were drawn to the city due to the patronage of the Habsburgs, and made Vienna the European capital of classical music. Joseph Haydn, Wolfgang Amadeus Mozart, Ludwig van Beethoven, Franz Schubert and Johann Strauss II, among others, were associated with the city, with Schubert being born in Vienna. During the Baroque period, Slavic and Hungarian folk forms influenced Austrian music. Vienna's status began its rise as a cultural center in the early 16th century, and was focused around instruments including the lute.
Hidetsugu Yagi was a Japanese electrical engineer from Osaka, Japan. When working at Tohoku University, he wrote several articles that introduced a new antenna designed by his colleague Shintaro Uda to the English-speaking world.
An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar or other detection systems, like infrared (IR) or lasers. It may be used both offensively and defensively to deny targeting information to an enemy. The system may make many separate targets appear to the enemy, or make the real target appear to disappear or move about randomly. It is used effectively to protect aircraft from guided missiles. Most air forces use ECM to protect their aircraft from attack. It has also been deployed by military ships and recently on some advanced tanks to fool laser/IR guided missiles. It is frequently coupled with stealth advances so that the ECM systems have an easier job. Offensive ECM often takes the form of jamming. Self-protecting (defensive) ECM includes using blip enhancement and jamming of missile terminal homers.
An electronic component is any basic discrete device or physical entity in an electronic system used to affect electrons or their associated fields. Electronic components are mostly industrial products, available in a singular form and are not to be confused with electrical elements, which are conceptual abstractions representing idealized electronic components.
The German-English Academy Building is a school built in Milwaukee, Wisconsin in 1891 for the German-English Academy, which later became the University School of Milwaukee. The Academy played an important role during a time when Milwaukee was known as "the most German city in America." The building is listed on the National Register of Historic Places and is now owned by the Milwaukee School of Engineering. Since 2012, it has been leased to the company Direct Supply as a technology center.
It is beside the Grohmann Museum.
Melnyk is a surname of the Ukrainian origin means "miller". It is the most common family surname in Ukraine.
Heinz Schlicke, German-born engineer and author, an Operation Paperclip scientist, and engineer at the Allen-Bradley Co. in Milwaukee, Wisconsin.
A Sutton tube, or reflex klystron, is a type of vacuum tube used to generate microwaves. It is a low-power device used primarily for two purposes; one is to provide a tuneable low-power frequency source for the local oscillators in receiver circuits, and the other, with minor modifications, as a switch that could turn on and off another microwave source. The second use, sometimes known as a soft Sutton tube or rhumbatron switch, was a key component in the development of microwave radar during World War II. Microwave switches of all designs, including these, are more generally known as T/R tubes or T/R cells.
