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4hv.org :: Forums :: High Voltage
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Tasks such as this should not be attempted by man.

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Microwatt
Tue Feb 22 2011, 10:52PM
Microwatt Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224
Do you think that having fewer windings per pancake would solve the capacitance issue?
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Wolfram
Wed Feb 23 2011, 07:35AM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Microwatt, it would lower the capacitance somewhat, but it would still be far from practical, maybe even impossible, to make a transformer with 3000 secondary turns work at 80kHz. I think the best way of winding HV secondaries for high frequencies is the Steve Ward single-layer method Link2 .

Grenadier, I think a multiplier is the best approach. Maybe you could take some inspiration from the original transformer that used to be on your multiplier board:


1298446502 33 FT108894 Dsc 4960
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Adam Munich
Wed Feb 23 2011, 07:46AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Actually I tried using my 1940s AC flyback and I've been getting really loud sparks out of the multiplier, loud enough that I need earmuffs. I've heard 1mA sparks from an iron cored xrt before and I think I'm getting about 1mA, though I'm not sure how its happening at 30khz...

(yes, I have a 15 meg resistor on the output, so the diodes are safe)

Also, what are the chances that i'd see another multiplier like that? neutral
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Wolfram
Thu Feb 24 2011, 12:25PM
Wolfram Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
Grenadier wrote ...

Also, what are the chances that i'd see another multiplier like that? neutral

Surprisingly high. Do you know where the board you have came from?
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Adam Munich
Thu Feb 24 2011, 06:01PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I do not.

Also, do you know the ratings of its diodes?
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