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4hv.org :: Forums :: High Voltage
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Marx generator with 4kV SSNST

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Mads Barnkob
Tue Apr 15 2008, 09:27PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Its build and running "great", since it do not have a trigger circuit there is alot of firing in the sparkgaps without a proper discharge.

NST delivers 4kV 20mA 20kHz and are put through 6 steps.
Its build with 1nF 7.5kV ceramic capacitors and 2x1M5 2.5kV resistors, and to rectify I use a string of 10 1N4007 diodes, which despite the warnings seems to work ok.

I can get a max of about 18 - 21 milimeter sparks, which is ok compared to the teoretical 24kV output.

my only beef atm is that the circuit aint too happy about triggering itself, on my NST I have quite long wires from the secondary (they are built into the transformer), and I can speed up the firing rate alot by strethcing the wires out in parallel, but they also get hot where they are too close.

text on my homepage is in danish, so I hope the above explanation will be enough :)

Pictures and schematics can be seen at my homepage: Link2
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quicksilver
Thu Apr 17 2008, 02:50PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Attached is an Excel spreadsheet for designing voltage multipliers. It's been productive for me to keep records of designs other than simple layouts or text files, etc.
]excel-voltage-multi.zip[/file]
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Mads Barnkob
Sat Apr 19 2008, 09:47PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
quicksilver wrote ...

Attached is an Excel spreadsheet for designing voltage multipliers. It's been productive for me to keep records of designs other than simple layouts or text files, etc.


Thanks for the spreadsheet, but could you please explain a couple of things to me

Vout is 4kV
Iout is 20mA
I got 6 stages
and output freq. is 20kHz

how do I know the ripple %? is that the 1.4 times Vout as mentioned in an earlier post? and what is the reg%?
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quicksilver
Sun Apr 20 2008, 04:53PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Seems you're going to have to add on to what's there. I just started it - as a way to maintain records. If everyone contributes a bit; it may eventually get pretty nice.

There is a pretty simple formula for percentages; I'll load it see.
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Proud Mary
Sun Apr 20 2008, 06:07PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
quicksilver wrote ...

Seems you're going to have to add on to what's there. I just started it - as a way to maintain records. If everyone contributes a bit; it may eventually get pretty nice.

There is a pretty simple formula for percentages; I'll load it see.

There seems to be some confusion here, lads. That Excel spreadsheet calculator is for Cockcroft & Walton type voltage multipliers, and can't be applied to a Marx at all.
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Mads Barnkob
Mon Apr 21 2008, 02:06PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Harry wrote ...

quicksilver wrote ...

Seems you're going to have to add on to what's there. I just started it - as a way to maintain records. If everyone contributes a bit; it may eventually get pretty nice.

There is a pretty simple formula for percentages; I'll load it see.

There seems to be some confusion here, lads. That Excel spreadsheet calculator is for Cockcroft & Walton type voltage multipliers, and can't be applied to a Marx at all.


that explains alot :)
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quicksilver
Mon Apr 21 2008, 02:25PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
(Displays red face, kicks at the ground sheepishly) ahhh yea...that's right...ahhhh... oops.
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Mads Barnkob
Mon Apr 28 2008, 04:01PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I ran the generator abit after I got home from work to film it, and it ran surprisingly well, giving 20mm sparks without much jittering.

Only got a canon ixus 70 so it aint too fancy with focus on film :(

youtube link -> Link2
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