Oudin coil

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Oudin coil used for medical 'electrotherapy', 1907.

An Oudin coil, also called an Oudin oscillator or Oudin resonator, is a disruptive discharge coil wired as a transformer designed to produce high voltage arcs and discharges, similar to a Tesla coil. It was invented by French physician Paul Marie Oudin and physicist Jacques d'Arsonval in 1882 (Due to a patent dispute a US patent was not granted until 1889). The device is a high frequency current generator which uses the principles of resonant electrical circuits. It produces an antinode of high potential. The high-voltage, self-regenerative resonant transformer has the bottom ends of the primary and secondary coils connected together and to ground. Oudin coils generate high voltages at high frequency, but produce lower currents than other disruptive discharge coils (such as the later version of the Tesla coil). The Oudin coil is modified for greater safety.

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