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4hv.org :: Forums :: High Voltage
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Crap bought a lot of PETP -.-

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brtaman
Thu Jun 18 2009, 06:38PM Print
brtaman Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Hey,

I have a boat load of PETP caps coming my way:

32x 4kv 0.01uF PETP caps

60x 4kv 3,300pF PETP caps

I was planning on using them in my tesla coils, yet I just read that they are pretty much useless at the frequencies a TC operates. They didn't cost me much 24 bucks shipped so its not a horrible loss (I guess???). They are milspec caps (russian military)

Since they are on the way I might as well use them. Got any good HV projects where I can use these caps?

I am planning a CW multiplier with them, (would they be good for at least this?).


Thanks
brtaman
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Backyard Skunkworks
Thu Jun 18 2009, 06:51PM
Backyard Skunkworks Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
They would work very well in a CW multiplier, or Marx generator.

I would double check your info their uselessness in a TC though, IIRC polyethylene is one of the best dielectrics at radiofrequency.
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brtaman
Thu Jun 18 2009, 07:02PM
brtaman Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Hey,

Thanks for the quick reply. I thought they would be good too, but then I read these threads:

Link2

Link2

Is their info wrong? If I could use them it would be great.

I will look into making the largest marx generator ever. :)
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Proud Mary
Thu Jun 18 2009, 07:13PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Yes, PETP ("Mylar") has a high dielectric absorption and will over-heat at Medium Frequency usual in TCs.

As Skunks said, they could do well in a small C&W, perhaps seriesing them in 3s to bring up the working voltage to 12kV.

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brtaman
Fri Jun 19 2009, 11:11AM
brtaman Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 247
Thanks for the suggestions. Guess I will make a CW multiplier, too bad these caps are useless for tesla coils though, they are dirt cheap and given that they are mil-spec they should be of top notch quality.
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