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Oudin coil (or Oudin resonator; named after its inventor Paul Oudin)

Ignition coil or induction coil used in the ignition system of a petrol engine

Flyback transformer of a CRT television set or vidéo monitor.

Electrical breakdown and insulation testing of high voltage equipment and cables

Other applications of resonant transformers are as coupling between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by the tuned transformers of the intermediate-frequency amplifiers.

A voltage regulating transformer uses a resonant winding and allows part of the core to go into saturation on éach cycle of the alternating current. This effect stabilizes the output of the regulating transformer, which can be used for equipment that is sensitive to variations of the supply voltage. Saturating transformers provide a simple rugged method to stabilize an ac power supply. However, due to the hysteresis losses accompanying this type of operation, efficiency is low.