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NNTP-Posting-Date: Wed, 11 Dec 2002 18:43:11 -0600
From: "John Fields"
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
Subject: Re: Driving a coil-driven relay
Date: Wed, 11 Dec 2002 18:44:17 -0800
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"Tony Williams" wrote in message
> I don't think it matters John... a diode across
> the Close coil is likely to be one of the things
> that is absorbing the energy when trying to drive
> the Open coil.
As I recall, he was having trouble driving the CLOSE coil, (and I gave him a
way to determine whether transformer action due to the mutual induction of
the OPEN coil was the culprit) but hang on a second... what my error was was
to put the diode in backwards, so instead of soaking up the L(di/dt) spike
when the MOSFET turned off, when the MOSFET turned on what it would do
would be to discharge the BFC through the MOSFET without even going through
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