Re: Reducing Self Resonance In Rolled Caps

• To: tesla-at-pupman-dot-com
• Subject: Re: Reducing Self Resonance In Rolled Caps
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 16 Feb 2000 17:11:17 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi William,

> Original Poster: "William Parn" <parn-at-fgm-dot-com> 
> 
> 
> I am still very new and learning, however here goes.
> 
> I have heard a lot about rolling caps, however there also
> appears to be size limitation due to self resonating
> qualities of rolled caps.  Can we just roll them using
> extended foil design so as to prevent self resonance?
> 
> What I mean here is to extend the foil out 
> the top of one plate and then extend it out the bottom
> of the other plate.  Roll it up and then bring all 
> the foil at the top together and make a connection
> then do the same at the bottom.
> 
> Has this been tried?

Exactly the design I published in an article in 1995.

> If yes, What are the results?

Low series inductance and had the capacitor been run under oil, 
very low resistive losses. Excellent discharge characteristics 
nonetheless.

> Would this prevent self resonance?

No - it just pushes the resonant frequency way beyond 
consideration. 

All professionally built pulse discharge capacitors are built this way.

Regards,
Malcolm

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