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Machine in operation.
Here you can see the arc of up to one inch showing an output of approximately 8000V at about 20KHz.
There is a smell of ozone, that's to be expected.
The heatsink is quite hot (to the touch) after 10 minutes of operation when an arc is drawn, or a coil is connected. (Expected. This machine is about 60 Watts. The transistor switch can dissipate around 115W with the appropriate cooling.)
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Coil wound on cup for exciting materials of your choice.
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Coil wound on cup and energised, showing corona glow.
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Here we have a test tube full of quartz crystal chips, then sealed.
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Here, the tube is wound with a coil and energised. Note the particularly bright corona glow. The coil gets noticably warmer after several minutes of operation. There is a very strong smell of ozone also.
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When using a coil, note the shorter (1/4"), but "fiercer" arc compared to the 1st photo.
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Note the neon tube glows with no connection due to the electric field. Tesla worked on this "wireless" principle for lighting.
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