Oudin coil

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A Oudin coil (also called an Oudin Oscillator or Oudin resonator) is a disruptive discharge coil. This autotransforming resonator is named after its inventor, Paul Marie Oudin, who developed it in conjunction with Jacques d'Arsonval.

The device is a high frequency current generator which uses the principles of electrical resonant circuits. It produces an antinode of high potential. The high-voltage, self-regenerative resonant transformer has the bottom end of the primary and secondary coils connected together and firmly grounded.

Oudin coils generate high voltages at high frequency. Oudin coils produce smaller currents than other disruptive discharge coils (such as the later version of the Tesla coil). The Oudin coil is modified for greater safety.