RE: Reducing Inductance In Caps And ?, Was RE: Reducing Self Resonance In Rolled Caps

• To: tesla-at-pupman-dot-com
• Subject: RE: Reducing Inductance In Caps And ?, Was 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: Thu, 17 Feb 2000 17:22:44 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Bill,
> Original Poster: "William Parn" <parn-at-fgm-dot-com> 
> 
<snip>
> I had read that rolled caps self resonate, because they are a cap
> and a coil all at the same time.  However now I understand they must 
> have really meant that rolled caps have higher inductance.  There
> by slowing the charging and discharging time, that makes sense.
> 
> Now the question is if the inductance slows the charging and
> discharging, would not that change the overall freq in the primary?

By an amount commensurate with the ratio of cap inductance to 
primary inductance (first order approximation). Could be significant 
with a low inductance primary.
 
> For TC use is it better to use extended foil design or the non
> extended foil design in rolled caps?

Extended foil. 
 
> Does this inductance change the overall capacitance?

No
 
> Does it change the number of turns needed on the primary?

It could. It doesn't matter though. Long tank wiring also affects total 
inductance in the primary circuit.

Regards,
Malcolm

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