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RE: Another MMC capacitor? Mylar DF = lossy

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@pupman.com]
Sent: Saturday, May 20, 2000 6:36 PM
To: tesla@pupman.com
Subject: Re: Another MMC capacitor?

Original Poster: "Metlicka Marc" <mystuffs@orwell.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