English: Circuit diagram of a unipolar Tesla coil, a spark-excited resonant transformer circuit invented in 1891 by Serbian-American inventor Nikola Tesla, which produces high voltage, radio frequency alternating current at low current levels. This is a modern unipolar version of the circuit used for entertainment coils, in which one side of the secondary is grounded and the other side is connected to a toroidal-shaped capacitive high voltage terminal. A slightly different form of the circuit, with the positions of the capacitor and spark gap exchanged, is found at Tesla coil 3.svg
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