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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Help - Power mosfets - difficult load
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <3DB81206.E28CA99F@rica.net> <firstname.lastname@example.org> <3DB963BE.939694C2@rica.net> <email@example.com> <3DBC2B63.146AA440@rica.net> <firstname.lastname@example.org> <3DBD410E.C1296A4A@rica.net> <email@example.com>
Date: Mon, 28 Oct 2002 14:41:30 GMT
NNTP-Posting-Date: Mon, 28 Oct 2002 09:41:30 EST
fred bartoli wrote:
> John Popelish a =E9crit dans le message :
> > Bill Allison wrote:
> > >
> > > John Popelish wrote:
> > (snip)
> > > > unless the battery were right next to the control circuits. Maki=
> > > > the control circuit to be bolted directly to the battery would be=
> > > > better,
> > >
> > > It will be as nearly so as makes no odds.
> > >
> > > >and eliminate most of the supply side bypass requirement.
> > >
> > > But still need some? battery self-inductance?
> > The internals of the battery have very little inductance, but any
> > conductor has something like a nanohenry per foot, and if this
> nH/foot ???
> In case of non coupled force/return path, the loop inductance is on the=
> order (sligthly less than) of mu0 which is about 1.25uH/m !!!
> The ordinary retained value is 1nH/mm which is 300nH/foot. Far above yo=
> Even a 50ohm coax (that have a fair amount of coupling) has a loop
> inductance on the order of 50^2*100pF/m =3D 250nH/m, which is 75nH/foot=
> Update your figures, John!
Thanks for the help, Fred. I think I confused the nanosecond per foot
propagation time with the inductance per foot. Now, how will I
remember 1 nhy/mm? Hmmm...
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