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This is a modern unipolar version commonly used in entertainment coils, with a toroidal-shaped metal capacitive load E on the high voltage terminal. The primary circuit is shown connected to the primary winding L1 with a variable tap, so that the primary and secondary coils can be adjusted to resonance.
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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 ...
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
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.
Tesla explains that in some applications (which he does not specify) the self-inductance of a conventional coil is undesired and has to be neutralised by adding external capacitors. The bifilar coil in this configuration has increased self-capacitance, thereby saving the cost of the capacitors.
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