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HP 200A
The HP 200A was the first product made by Hewlett-Packard and was manufactured in David Packard's garage in Palo Alto, California. It was a low-distortion audio oscillator used for testing sound equipment. It used the Wien bridge oscillator circuit, that had been the subject of Bill Hewlett's Masters thesis. It was also the first such commercial oscillator to use a simple light bulb as the temperature-dependent resistor in its feedback network. The light bulb was an inexpensive and effective automatic gain control that not only kept the oscillator output amplitude constant, but it also kept the oscillator's loop gain near unity. The latter is a key technique for achieving a low distortion oscillator. Earlier, Larned Meacham had used light bulbs in bridge circuits to stabilize and linearize oscillators in 1938. The product code was chosen to give the impression that HP was an established company. Walt Disney Walter Elias Disney (; December 5, 1901December 15, 1966) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hp200a-front-panel
HP may refer to: Businesses and organisations * HP Inc., an American technology company ** Hewlett-Packard, the predecessor to HP Inc. * HP Foods ** HP Sauce, formerly made by HP Foods * Handley Page, an aircraft company * Hindustan Petroleum * America West Airlines (1981-2006), an American airline (IATA code HP) * Amapola Flyg (2004-present), a Swedish airline (IATA code HP) * HP Books, an imprint of the Penguin Group Media, music, and entertainment * '' Harry Potter'', a novel series by J.K. Rowling * Hello Project, a J-pop idol brand under Japanese music company Up-Front Group * '' Horse-Power: Ballet Symphony'', a 1932 ballet composed by Carlos Chávez * Hot Package, a TV show created by Adult Swim Places * Harrison Plaza, a shopping mall in the Philippines that closed down in 2019 * Heart Peaks, a volcano in Canada * Himachal Pradesh, a state in India * HP postcode area, UK Science and technology * Haptoglobin, a protein * Hypersensitivity pneumonitis, a respira ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Bulb
An electric light, lamp, or light bulb is an electrical component that produces light. It is the most common form of artificial lighting. Lamps usually have a base made of ceramic, metal, glass, or plastic, which secures the lamp in the socket of a light fixture, which is often called a "lamp" as well. The electrical connection to the socket may be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap. The three main categories of electric lights are incandescent lamps, which produce light by a filament heated white-hot by electric current, gas-discharge lamps, which produce light by means of an electric arc through a gas, such as fluorescent lamps, and LED lamps, which produce light by a flow of electrons across a band gap in a semiconductor. Before electric lighting became common in the early 20th century, people used candles, gas lights, oil lamps, and fires. Vasily Vladimirovich Petrov developed the first persistent electric arc in 1802, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hewlett-Packard Products
The Hewlett-Packard Company, commonly shortened to Hewlett-Packard ( ) or HP, was an American multinational information technology company headquartered in Palo Alto, California. HP developed and provided a wide variety of hardware components, as well as software and related services to consumers, small and medium-sized businesses ( SMBs), and large enterprises, including customers in the government, health, and education sectors. The company was founded in a one-car garage in Palo Alto by Bill Hewlett and David Packard in 1939, and initially produced a line of electronic test and measurement equipment. The HP Garage at 367 Addison Avenue is now designated an official California Historical Landmark, and is marked with a plaque calling it the "Birthplace of 'Silicon Valley'". The company won its first big contract in 1938 to provide test and measurement instruments for Walt Disney's production of the animated film '' Fantasia'', which allowed Hewlett and Packard to formally est ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hertz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one hertz is the reciprocal of one second. It is named after Heinrich Rudolf Hertz (1857–1894), the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz are commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronics are driven. The units are sometimes also used as a representation of the energy of a photon, via the Planck relation ''E'' = ''hν'', where ''E'' is the photon's energy, ''ν'' is its f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fantasia (1940 Film)
''Fantasia'' is a 1940 American animated musical anthology film produced and released by Walt Disney Productions, with story direction by Joe Grant and Dick Huemer and production supervision by Walt Disney and Ben Sharpsteen. The third Disney animated feature film, it consists of eight animated segments set to pieces of classical music conducted by Leopold Stokowski, seven of which are performed by the Philadelphia Orchestra. Music critic and composer Deems Taylor acts as the film's Master of Ceremonies who introduces each segment in live action. Disney settled on the film's concept in 1938 as work neared completion on ''The Sorcerer's Apprentice'', originally an elaborate '' Silly Symphony'' cartoon designed as a comeback role for Mickey Mouse, who had declined in popularity. As production costs surpassed what the short could earn, Disney decided to include it in a feature-length film of multiple segments set to classical pieces with Stokowski and Taylor as collaborators ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walt Disney
Walter Elias Disney (; December 5, 1901December 15, 1966) was an American animator, film producer and entrepreneur. A pioneer of the American animation industry, he introduced several developments in the production of cartoons. As a film producer, he holds the record for most Academy Awards earned and nominations by an individual, having won 22 Oscars from 59 nominations. He was presented with two Golden Globe Special Achievement Awards and an Emmy Award, among other honors. Several of his films are included in the National Film Registry by the Library of Congress and have also been named as some of the List of films considered the best, greatest films ever by the American Film Institute. Disney was the first person to be nominated for Academy Awards in six different categories. Born in Chicago in 1901, Disney developed an early interest in drawing. He took art classes as a boy and got a job as a commercial illustrator at the age of 18. He moved to California in the early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Larned Meacham , American Thoroughbred racehorse
{{disambiguation, place name, surname ...
Larned can refer to: * Charles Larned (died 1834), lawyer, military officer, and politician * Josephus Nelson Larned (1836-1913), American journalist, educator, librarian, historian * Larned B. Asprey * Scott Larned (1969–2005), keyboardist * Simon Larned (1753–1817), U.S. Representative from Massachusetts * William Larned, American tennis player See also * Larned, Kansas, a small city in the United States * Fort Larned National Historic Site * Fort Larned (horse) Fort Larned (foaled April 14, 2008) is an American Thoroughbred racehorse best known for winning the 2012 Breeders' Cup Classic. Background Fort Larned is a bay horse with a small white star. He was bred in Kentucky by Janis Whitham, under who ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Automatic Gain Control
Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input. The average or peak output signal level is used to dynamically adjust the gain of the amplifiers, enabling the circuit to work satisfactorily with a greater range of input signal levels. It is used in most radio receivers to equalize the average volume ( loudness) of different radio stations due to differences in received signal strength, as well as variations in a single station's radio signal due to fading. Without AGC the sound emitted from an AM radio receiver would vary to an extreme extent from a weak to a strong signal; the AGC effectively reduces the volume if the signal is strong and raises it when it is weaker. In a typical receiver the AGC feedback control signal is usually taken from the detector stage and applied to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bill Hewlett
William Redington Hewlett ( ; May 20, 1913 – January 12, 2001) was an American engineer and the co-founder, with David Packard, of the Hewlett-Packard Company (HP). Early life and education Hewlett was born in Ann Arbor, Michigan, where his father taught at the University of Michigan Medical School. In 1916 the family moved to San Francisco after his father, Albion Walter Hewlett, took a similar position at Stanford Medical School, located at the time in San Francisco. He attended Lowell High School and was the 1929-1930 Battalion Commander of the school's Army JROTC program. He was accepted at Stanford University as a favor to his late father who had died of a brain tumor in 1925. Hewlett received his bachelor's degree from Stanford University in 1934, a Master of Science degree in electrical engineering from MIT in 1936, and the degree of Electrical Engineer from Stanford in 1939. He joined the Kappa Sigma fraternity during his time at Stanford. Career Hewlett-Packa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hp200a-insides-crop
HP may refer to: Businesses and organisations * HP Inc., an American technology company ** Hewlett-Packard, the predecessor to HP Inc. * HP Foods ** HP Sauce, formerly made by HP Foods * Handley Page, an aircraft company * Hindustan Petroleum * America West Airlines (1981-2006), an American airline (IATA code HP) * Amapola Flyg (2004-present), a Swedish airline (IATA code HP) * HP Books, an imprint of the Penguin Group Media, music, and entertainment * '' Harry Potter'', a novel series by J.K. Rowling * Hello Project, a J-pop idol brand under Japanese music company Up-Front Group * '' Horse-Power: Ballet Symphony'', a 1932 ballet composed by Carlos Chávez * Hot Package, a TV show created by Adult Swim Places * Harrison Plaza, a shopping mall in the Philippines that closed down in 2019 * Heart Peaks, a volcano in Canada * Himachal Pradesh, a state in India * HP postcode area, UK Science and technology * Haptoglobin, a protein * Hypersensitivity pneumonitis, a respira ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wien Bridge Oscillator
A Wien bridge oscillator is a type of electronic oscillator that generates sine waves. It can generate a large range of frequencies. The oscillator is based on a bridge circuit originally developed by Max Wien in 1891 for the measurement of impedances. The bridge comprises four resistors and two capacitors. The oscillator can also be viewed as a positive gain amplifier combined with a bandpass filter that provides positive feedback. Automatic gain control, intentional non-linearity and incidental non-linearity limit the output amplitude in various implementations of the oscillator. The circuit shown to the right depicts a once-common implementation of the oscillator, with automatic gain control using an incandescent lamp. Under the condition that R1=R2=R and C1=C2=C, the frequency of oscillation is given by: f_=\frac and the condition of stable oscillation is given by R_b = \frac Background There were several efforts to improve oscillators in the 1930s. Linearity was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Audio Oscillator
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave or a triangle wave. Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices ranging from simplest clock generators to digital instruments (like calculators) and complex computers and peripherals etc. 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. Oscillators are often characterized by the frequency of their output signal: *A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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