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English: Circuit diagram of a Tesla coil, a spark-excited resonant transformer circuit invented in 1891 by Nikola Tesla. It generates very high voltage, radio frequency alternating current electricity 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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The Magnifying Transmitter's axial velocity electromagnetic field is established by the coil pitch and electrical charge propagation speed through the circuit. It is interesting to note that rigorous mathematical descriptions of Tesla's Magnifier did not become available until 50-100 years after Tesla's pioneering work.
English: An experimental Tesla coil circuit to duplicate the discharges of a Holtz electrostatic machine, from Tesla's 1892 lecture before the Institute of Electrical Engineers, London, England. Following the initial research of voltage and frequency by William Crookes, Nikola Tesla developed a series of coils that produced high-voltage, high ...
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English: Schematic diagram of the circuit of the "magnifying transmitter", a Tesla coil circuit invented by Serbian-American engineer Nikola Tesla in the 1890s. It differs from ordinary two-coil Tesla coil circuits in that Tesla has added a third coil (L3) attached to the high voltage end of the secondary (L2), which is not magnetically coupled to the other two coils.