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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: the issue was confused when i got there posted by jcox on March 8, 2002 at 00:37:16:
I cannot disagree with some of your assumptions. It is true that some NPO ceramic caps can be OK for some applications, but I tend to avoid them, because I have access to equal or better quality polystyrene, teflon, and polypropylene caps, and I don't want them confused with poorer quality ceramic caps that are cheaper and more available.
Personally, I have never measured anything really bad in a mica cap, but then these caps, like NPO ceramics are fairly small values in general, and are difficult to measure properly for DA. Still, while I might have used a mica cap in a critcal application 30 years ago, I now avoid them except when I need to use them for some reason. I have many hundreds of them in my lab, and just today I was wondering what to do with them, as I won't use them in any serious audio project.
I gave you 2 references earlier, but my reply was buried by an apparent glitch in the software on this website and it got put (more or less) in an archive file. Still: Try to look at:
'Capacitor Dielectric Absorption' IRE transactions on electronic computers, Paul C. Dow, 1958. This is one of the original complete papers and Pease's model of DA is in this paper.
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Follow Ups
- Re: the issue was confused when i got there - john curl 01:16:03 03/08/02 (0)