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From: Tony Williams
Subject: Re: generating calibration voltage
Date: Fri, 10 Jan 2003 14:11:18 +0000 (GMT)
References: <3E1C54DA.3DE2AC41@rica.net> <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Fri, 10 Jan 2003 15:40:32 +0000 (UTC)
User-Agent: Pluto/1.14i (RISC-OS/3.60)
In article <firstname.lastname@example.org>,
Bill Sloman wrote:
> Tony Williams' minature soft-iron toroids could take quite a lot more
> magnetic flux before they'd saturate, but the cross sectional area
> might be a bit low.
> I suspect he has a few toroids out of a magnetic core memory ...
You misread the "0.004"... they are toroids wound
with 0.004" thick mumetal strip, and enclosed in
a protective plastic case. The smallest is "0a"
size which is 5/8" od, and with a magnetic csa of
Mumetal has a r-permeability of about 20000 and a
Bsat up above 800mT..... so the turns-count would
be about 1/4 that of that ferrite core. Which would
allow a 1-turn (heavily screened) secondary.
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