EE 230 Lecture 9. Amplifiers and Feedback
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1 EE 230 Lecture 9 Amplifiers and Feedback
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3 The History of Vaccum Tubes or Electron Tubes 1 of 2 1/25/ :54 AM Inventors Welcome to About.com What is About.com? I'm Mary Bellis, your Guide to Inventors. If this Google search is not what you were looking for, you may want to see our other popular topics, such as Inventing Beginners, Patent Trademark Copyright, or Marketing and Business. FREE Inventors Newsletter Enter address Related Topics Agreements, Forms,... Famous Inventions Famous Inventors Technology Timelin... The History of Vacuum Tubes Electron Tubes - History of the Electron Tube Highlights By Mary Bellis In 1875, American, G.R. Carey invented the phototube. In 1878, Englishman Sir William Crookes invented the 'Crookes tube', an early prototype of cathode-ray tube. In 1895, German, Wilhelm Roengten invented an early prototype Xray tube. In 1897, German, Karl Ferdinand Braun invents the cathode ray tube oscilloscope. In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve'. Leming invents the vacuum tube diode. In 1906, Lee de Forest invented the audion later called the triode, an improvement on the 'Fleming Valve' tube. In 1913, William D. Coolidge invented the 'Coolidge Tube', the first practical Xray tube. In 1920, RCA began the first commercial electron tube manufacturing. In 1921, American Albert Hull invented the magnetron electronic vacuum tube. In 1922, Philo T. Farnsworth develops the first tube scanning system for television. In 1923, Vladimir K Zworykin invented the iconoscope or the cathode-ray tube and the kinescope In 1926, Hull and Williams co-invented the tetrode electronic vacuum tube. In 1938, Americans Russell and Sigurd Varian co-invented the klystron tube. source - The Tube Guy About Vacuum Discharge Tubes PV Scientific Instruments sells reproductions of antique vacuum tubes and is worth a visit for the images of old vacuum tubes (click on the small images in the bottom row) and the historical information that is included: "The earliest forms of such tubes appeared in the late 17th century but, although experimenters like Jean Picard, Francis Hauksbee, William Morgan, and even Michael Faraday experimented with vacuum discharge tubes, it was not until the 1850s that sufficient technology existed to produce sophisticated versions of such tubes. This technology included efficient vacuum pumps, advanced glassblowing techniques, and the Ruhmkorff induction coil." From A Thumbnail History of Electronics: Vacuum Tubes Six major figures in the field of vacuum tubes are discussed in synopsis on this website. General Understanding of Electron Tubes Electron Tube: General Description An electron tube typically consists of two or more electrodes enclosed in a glass or metal ceramic envelope that is wholly or partially evacuated. How Tubes Work How a typical triode vacuum tube works. Electron Tube An electron tube device consisting of a sealed enclosure in which electrons flow between electrodes separated either by a vacuum (in a vacuum tube) or by an ionized gas at low pressure (in a gas tube).
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6 Why not just use either dependent sources or op amps as amplifiers? Dependent Sources Not a Basic Device How are they made? Vacuum Tubes (in the past) Transistors MOSFET or BJT Highly nonlinear, temperature dependent, process variable Op Amps Gain not accurately controllable Gain often too large Highly nonlinear Difficult to keep operating point constant (discuss this later) How are they made? Vacuum Tubes (in the past) Transistors MOSFET or BJT Highly nonlinear, temperature dependent, process variable
7 Op Amp as an Amplifier V OUT = AV 1 V 1 A V OUT V OUT V 1 AV 1 Equivalent Circuit
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9 Harold Stephen Black - Wikipedia, the free encyclopedia 1 of 1 1/25/ :56 AM Harold Stephen Black From Wikipedia, the free encyclopedia. Harold Stephen Black ( ) is an electrical engineer who revolutionized the field of applied electronics by inventing the negative feedback amplifier in He graduated from Worcester Polytechnic Institute in After his graduation, he went on to work in Bell Labs. To some, his invention is considered the most important breakthrough of the century in the field of electronics, since it has a wide area of application. External link HS Black ( This article about an engineer, inventor or industrial designer is a stub. You can help Wikipedia by expanding it ( Retrieved from " Category: Engineer stubs This page was last modified 08:33, 30 September All text is available under the terms of the GNU Free Documentation License (see Copyrights for details). Wikipedia is a registered trademark of the Wikimedia Foundation, Inc. Privacy policy About Wikipedia Disclaimers
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In the tube collection there are several sensors designed for applications in some kinds of physics measurements or detection.
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