Going to be doing some highish voltage experiments soon, so I'm going to need something like this:
Linear controlled Royer oscillator, typically runs around 60kHz. Adjustable 220-2070V output. Seems to be fairly low ripple, but there may be some instability under certain operating conditions (~half scale voltage, half to full load?), which I think has to do with either parasitic instability in the oscillator itself, or RFI pickup by the poor LM358.
Don'cha just love how professional it makes things look, just having that damned yellow tape handy?
Efficiency ranges from 10-20% at low voltages up to 60, maybe 70% at full voltage. Good for 5-10mA (varies by voltage), so yes,
watch your fingers ladies and gentlemen!
At full output, I can draw a pretty reasonable "medium temperature" arc, using a 50k 5W (wirewound) resistor for current limiting.
Tim