File:Poulsen arc converter circuit.png
Poulsen_arc_converter_circuit.png (232 × 409 pixels, file size: 5 KB, MIME type: image/png)
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DescriptionPoulsen arc converter circuit.png |
English: Schematic diagram of the Poulsen arc converter, an early radio transmitter invented by Valdemar Poulsen in 1903, from his 1904 paper. It was one of the first continuous wave radio transmitters capable of transmitting sound (AM), and was used in many of the first radio stations until the early 1920s, when it was replaced by vacuum tube transmitters. It consists of a continuous electric arc across a spark gap (SG) supplied with a DC voltage (VDC) of about 500 volts. A resonant circuit consisting of a capacitor (C) and an inductor (L) is connected across it. The negative resistance of the arc cancels the inherent positive resistance of the tuned circuit, exciting sinusoidal oscillations in the tuned circuit.
The arc is inside a chamber of hydrogen gas, which allows higher frequency oscillations. The oscillations are encouraged by a magnetic "blowout", an electromagnet (M) that generates a magnetic field at right angles across the arc. At the peaks of the current the magnetic field exerts a a transverse force on the moving ions, "blowing" them out of the arc, cooling it, causing the current to decrease quickly. The radio frequency choke (RFC) prevents the oscillation current from passing through the power supply. Alterations to image: added labels (red) to the parts |
Date | |
Source | Retrieved May 28, 2015 from V. Poulsen, "System for producing continuous electric oscillations" in Transactions of the International Electrical Congress, St. Louis, 1904, Vol. 2, Section C: Electrochemistry, J. B. Lyon Co., 1905, p. 967, fig.3 on Google Books |
Author | Valdamar Poulsen |
Permission (Reusing this file) |
Valdemar Poulsen died in 1942 |
Licensing edit
Public domainPublic domainfalsefalse |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. | |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 20:47, 28 May 2015 | 232 × 409 (5 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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File change date and time | 20:16, 28 May 2015 |