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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I have twenty of the 2n2 20kV ebay Chinese ones in a Cockcroft & Walton generator where they have been reliable to date - though I shouldn't want to run them without dielectric oil as the leads are set quite close together. I bought a batch of 30kV PIV 10mA rectifiers from the same source, and they too have proved good so far.
They would make for a pretty darn small MMC. Probably of only 2 or 4 caps. I don't know if I would trust them, though. They're a little cheap. Amazing1.com has .02uF 10kV tesla coil capacitors for $230! The Chinese ones are .02uF 15kV and only $15.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I've bought both diodes and capacitors from this Chinese firm and found them to be good.
Why pay over the odds for something 'amazing' when you can get standard parts from a source close to the manufacturer? No one could ever afford to make anything at the 'amazing' price!
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
I wonder how well these polypropylene caps will hold up under high pulse current conditions? I see the 15kv 0.02uF caps for example have a spec of: "Ip-p = 130A". That doesn't leave me feeling warm and fuzzy about the tens of kA or more they may see in a marx generator.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I bought 20 capacitors which were equivalent to those, CompWiz, only mine were 470pF. I just (today) used all of them in a bipolar Marx generator which seems to be working well. The only problem I had was from the capacitors arcing over, which was easily solved with some epoxy. Rated for 15kV and only 1cm between the leads. I wouldn't take them over 10kV.
Penguin has made a Marx generator from cheap Chinese caps as well. So they are tried and true.
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Chinese caps for marx generator ??
I wouldn't take them over 10kV.