This is a Royer oscillator which is a relatively high power self resonant circuit useful for generating high voltages from flyback or other ferrite transformers. Output is probably around 2000 VAC. The arc stretches out to about an inch at a power of up to 300 W.
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Don’t put your hand in this one! This uses a disposable camera photoflash running off 3 V using a BD140 and heatsink substituted for the main HV transistor so it can now run at 1.5 A.
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This “lifter” is a lightweight construction that rises into the air under the action of ionic wind.
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