Oudin coil used for medical electrotherapy, 1907, and a schematic diagram of its circuit (left).
An Oudin coil, also called an Oudin oscillator or Oudin resonator, is a resonant transformer circuit that generates very high voltage, high frequency alternating current (AC) electricity at low current levels,[1][2][3] used in the obsolete forms of electrotherapy around the turn of the 20th century.[4] It is very similar to the Tesla coil, with the difference being that the Oudin coil was connected as an autotransformer.[2][5] It was invented in 1893 by French physician Paul Marie Oudin[6] as a modification of physician Jacques Arsene d'Arsonval's electrotherapy equipment[7][8] and used in medical diathermy therapy as well as quack medicine until perhaps 1940. The high voltage output terminal of the coil was connected to an insulated handheld electrode which produced luminous brush discharges, which were applied to the patient's body to treat various medical conditions in electrotherapy.[4]
^Strong, Frederick Finch (1908). High-frequency currents. Rebman Company. p. 41.
^ abCurtis, Thomas Stanley (1916). High Frequency Apparatus: Its Construction and Practical Application. New York: Everyday Mechanics Co. Inc. pp. 45–47. Oudin coil.
^Martin, James M. (1912). Practical electro-therapeutics and X-ray therapy. C.V. Mosby Co. pp. 187–192. Oudin coil.
^ abStrong, Frederick Finch (1918). Essentials of modern electro-therapeutics (2 ed.). New York: Rebman Co. pp. 73–75. Oudin.
^Hickman, Bert (November 30, 2000). "Re: Oudin vs Tesla coils". Tesla Coil Mailing List. Chip Atkinson's website. Retrieved December 2, 2014.
^Manders, Horace (August 1, 1902). "Some phenomena of high frequency currents". Journal of Physical Therapeutics. 3 (1). London: John Bale, Sons, and Danielsson, Ltd.: 226. Retrieved December 2, 2014.
^Filingeri, V.; Gravante, G.; Cassisa, D. (2005). "Physics of radiofrequency in proctology" (PDF). European Review for Medical and Pharmacological Sciences. 9 (6): 349. Retrieved April 11, 2015.
^Eberhart, Noble Murray (1919). A Working Manual of High Frequency Currents (5 ed.). Chicago: New Medicine Publishing Co. pp. 40. Oudin resonator.
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