[R-390] Orange Drop vs ceramic disc

[Shoppa, Tim]

See e.g. http://www.edn.com/contents/images/6430345.pdf for some real graphs.

X7R is clearly superior to Y5V, but not as good as film capacitors for low-distortion audio.
________________________________________
From: r-390-bounces at mailman.qth.net [r-390-bounces at mailman.qth.net] On Behalf Of MillerKE6F at aol.com [MillerKE6F at aol.com]
Sent: Wednesday, March 30, 2011 3:27 PM
To: n4buq at knology.net; r-390 at mailman.qth.net
Subject: Re: [R-390] Orange Drop vs ceramic disc

Has anyone in this august group made any definitive measurements of
distortion or other glitches on a typical X7R Ceramic capacitor.    I've been told
 that in some high gain audio circuits that some poorly  made ceramic caps
may tend to act as piezo sensors, but I'll have to do some  testing to
confirm that parameter.

As to metallized fim vs foil and film.  Other than self healing and  lower
pulse current capability,  I'd be surprised if one could measure the
difference between the two in connection with distortion or power factor.

    Thanks

    Bob, KE6F
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