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I have some capacitors...

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Dr. ISOTOP

Fri Dec 03 2010, 08:18PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

I found 16 80KV/6.66nF capacitors the other day

I think they're real pulse caps, but I'm not sure, especially since Ion Physics Corporation seems to manufacture current monitors and small Marx Generators these days, not capacitors.
Anyone know anything more about these caps? I'm trying to figure out something fun to do with them.

Adam Munich

Fri Dec 03 2010, 09:31PM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

well you could give them to me!

But they are only 21J per cap, so maybe a really big marx generator?

ScotchTapeLord

Fri Dec 03 2010, 10:35PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

Either a Marx Generator or a can crusher... though it would be more like a can obliterater. I would suggest coin shrinking but 4hv does not permit speak of illegal activities (i.e. taking currency out of circulation). ;)

Actually, the first thing you should consider is a HV capacitor charger if you don't already have one! :)

... I am filled with envy! Let me know if you ever have one too many capacitors and ~200 dollars too few.

Dr. ISOTOP

Fri Dec 03 2010, 10:52PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

Hmm...I wonder how suitable these would be for Tesla coil use.
A 16-stage Marx generator sounds cool

though I worry there will be technical difficulties involved in building one.

Adam Munich

Fri Dec 03 2010, 11:05PM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

80kV * 16 = 1.28MegaVolts

Go 4 the marx man! Use these caps at their full potential, you could use an x-ay transformer to charge them all up very fast. Ho does meter long sparks, maybe even 5 times a second sound? It's going to be very loud with those caps, that's 4 sure.

Dr. ISOTOP

Fri Dec 03 2010, 11:15PM

Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652

Meter-long sparks sounds beautiful...now all I have to do is find some charging resistors (and an x-ray transformer).
Does replacing the charging resistors with inductors work? I've heard of people trying it, but I can find very little information on whether it works in practice.

Adam Munich

Fri Dec 03 2010, 11:29PM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

It works, but you'll have to find someone else to help you there.

X-ray transformers are easy to come by, all you need to do is buy a dental x-ray head on ebay and disassemble it. A 50kVp one should do just fine since it ill give you (50kv / .707) = 70KV peak out. Plus you'll have an x-ray tube at your disposal to do anything you want with.

ScotchTapeLord

Sat Dec 04 2010, 01:07AM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

If you can't find specs then I wouldn't go for a Tesla Coil. Pulse discharge is meant for quick and powerful events, not continuous with 100% voltage reversal.

I'm thinking Marx generator is your best bet. I think you'd better start with just like three, as you'll find it becomes somewhat of an EMP bomb at around that point...

Inductors will work great, so just grab some magnet wire and wind some single-layer air coils with a couple hundred turns... you'll need a lot for voltage standoff and blocking the relatively longer pulse from 6.66nF.

It may sound a bit daunting but 80kV resistors won't be an easy task either and will elongate the charging time...

Like I said, start with three... :)

Wolfram

Sat Dec 04 2010, 01:35AM

Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971

Grenadier wrote ...

X-ray transformers are easy to come by, all you need to do is buy a dental x-ray head on ebay and disassemble it. A 50kVp one should do just fine since it ill give you (50kv / .707) = 70KV peak out. Plus you'll have an x-ay tube at you disposal to do anything you want with.

X-ray transformers are specified in peak voltage, so a 50kV one will give 50kV peak. 50kV ones aren't very common at all though, 70kV ones are by far the most common, and 90-100kV ones are used in some dental x-ray heads.

Anders M.

Adam Munich

Sat Dec 04 2010, 02:31AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Ahh I didn't know they specified them in peak voltage. Go for a 70kVp x-ray head then!

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