RE: Another MMC capacitor? Mylar DF = lossy

• To: tesla-at-pupman-dot-com
• Subject: RE: Another MMC capacitor? Mylar DF = lossy
• From: "Dale Hall" <Dale.Hall-at-trw-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 21 May 2000 12:42:39 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Marc,
The dielectric Mylar has a higher dissipation constant, DF, than PP, PE, Mica.
See Scott Hansens latest Cap DF vs F Excel spreadsheet or any Electronics
reference book.

Simply put the molecules comprising the Mylar dielectric 
offer greater resistance to alternating cycles of current, creating heat
(loss),
that occurs to a much lesser degree in other dielectrics such as PP, etc.

The result is real power consumed in a larger value Cap parallel resistance or 
mathematically equivalent Cap series resistance.

Mylar possesses a respectively low DC current leakage,
but suffers when that amplitude begins alternating worsening
as that amplitude increases and as AC alternates faster (higher frequency)

Regards, Dale

-----Original Message-----
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, May 20, 2000 6:36 PM
To: tesla-at-pupman-dot-com
Subject: Re: Another MMC capacitor?

Original Poster: "Metlicka Marc" <mystuffs-at-orwell-dot-net> 

jim, if it isn't to much trouble could you explain why mylar is lossy
compaired to polypro.? i am intrieged by this mmc production and have
been following terrys threads dilagently.
thank you for your time,       marc

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