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Re: But how do they do it? (Was: Re: New Maxwell on ebay)



Original poster: tesla-at-lists.symmetric-dot-net 

On Thu, 5 Aug 2004, Tesla list wrote:

 > Original poster: "Gregory Hunter" <ghunter31014-at-yahoo-dot-com>
 >
 > I've been following this thread, and I hafta know--if
 > any of you know--how do Maxwell and other commercial
 > cap builders do it? How do they get so much
 > high-voltage capacitance into such a small package? If
 > they are using polypropylene film, then why are
 > homebuilt caps of similar performance so much bulkier
 > than Maxwells? Are Maxwell, Plastic Capacitors Inc.,
 > et al, not bound by the capacitance formula like us
 > mortals? I'm aware that detailed info on this is

They don't make them the way people at home do. They use thin film
sections, not thick sheets of plastic (which just makes a larger capacitor
in the end). This is the main reason for small sized capacitors. You want
thin dielectric sections. This also makes winding the sections much
harder. I'm not able to work with anything less than 1 mil polypropylene
and not end up with a wrinkled mess. The thin foil used in capacitors is
hard to work with as well. They don't use roof flashing and other way too
thick materials in real high voltage capacitors.

KEN