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From: max@eros.uucp (Max Hauser)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Skin depth: background information
Message-ID: <1888@ucbcad.berkeley.edu>
Date: Wed, 23-Sep-87 10:26:06 EDT
Article-I.D.: ucbcad.1888
Posted: Wed Sep 23 10:26:06 1987
Date-Received: Sat, 26-Sep-87 03:09:33 EDT
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Reply-To: max@eros.UUCP (Max Hauser)
Organization: University of California, Berkeley
Lines: 11
Summary: Correcting a bad number
Xref: mnetor rec.audio:3391 sci.electronics:1404

What did I say about moments of distraction? I blew a decimal in
my associated article.

>Skin depths for metals consistently follow the form d / sqrt(freq),
>where the constant of proportionality, d, is 66 mm for copper;
>83 mm for aluminum; 64 mm for silver, and 18.5 mm for typical
>solder alloy [2]. ...

The last should be d = 185 mm for solder, so at 20 kHz, the depth is
1.3 mm for solder, not 0.13mm as in my original, which contradicted
the previous pph as well.