The Physics Dept of the Uni of Western Australia had this Tesla coil which dates back 40 years. Made in Germany according to the nameplate. Apparently runs at 1 MHz but lots of problems with the Leyden jar caps. It still not functioning despite various attempts so despite the historical interest it was felt a new one was needed of more modern design. So I put my hand up.
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The Tesla Coil 4-Inch Ver 1 is the earliest version of the 4 inch diameter secondary coils and is shown here in early grainy low light photographs. How things have changed! Still, a wondrous moment to see bigger sparks for the first time.
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Neon sign transformers are the starting point for many beginners Tesla coils. They are a handy 12 kV peak unloaded and 30 mA into a short circuit which is current limited.
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The second version 4 inch diameter Tesla coil uses much higher power components.
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The second version Tesla Coil 4-inch in diameter is driven by 4 microwave oven transformers (MOT’s) and puts out 4 foot sparks.
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