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- Henry Rowland's 1889 spark-excited resonant transformer, a predecessor to the Tesla coil (en)
- Steps in Tesla's development of the Tesla transformer around 1891: Closed-core transformers used at low frequencies, rearranging windings for lower losses, removed iron core, partial core, final conical Tesla transformer, Tesla coil circuits and Elihu Thomson (en)
- Typical circuit configuration. Here, the spark gap shorts the high frequency across the first transformer that is supplied by alternating current. An inductance, not shown, protects the transformer. This design is favoured when a relatively fragile neon sign transformer is used. (en)
- Bipolar coil, used in the early 20th century. There are two high-voltage output terminals, each connected to one end of the secondary, with a spark gap between them. The primary is 12 turns of heavy wire, which is located at the midpoint of the secondary to discourage arcs between the coils. (en)
- Tesla coil at Questacon, the National Science and Technology center in Canberra, Australia (en)
- Alternative circuit configuration. With the capacitor in parallel to the first transformer and the spark gap in series to the Tesla-coil primary, the AC supply transformer must be capable of withstanding high voltages at high frequencies. (en)
- Unipolar coil design widely used in modern coils. The primary is the flat red spiral winding at bottom, the secondary is the vertical cylindrical coil wound with fine red wire. The high-voltage terminal is the aluminum torus at the top of the secondary coil. (en)
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