[SI-LIST] Re: Latching relays in optical switches
- From: "Aubrey Sparkman" <asparkman@xxxxxxxxxxxxx>
- To: "'Kevin G. Rhoads'" <kgrhoads@xxxxxxxxxxxx>, "'Don Nelson'" <dhwn@xxxxxxx>
- Date: Tue, 19 May 2009 14:39:06 -0500
The question that occurs to me: Is there any other electronics inside that
you can't see? Are you sure you have only two coils wound on the same core?
If there are some built in FETs, they could have a preference and be causing
some trouble...
Aubrey Sparkman
Aubrey.K.Sparkman@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Kevin G. Rhoads
Sent: Tuesday, May 19, 2009 2:31 PM
To: Don Nelson
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Latching relays in optical switches
>The problem is, the manufacturer disagrees and insists our circuit
>needs to be redesigned to permanently tie one leg of the coils to GND and
switch the high side instead.
While that is more common, either should work. Particularly since you have
verified the +5 rail is not moving, which indicates it is a good ground for
all non-DC signals.
If you induce current in the other coil then the flux-linkage through the
magnetic circuit is kept minimal. That will interfere with switching.
As for: 'They contend that having the 5V potential on the coil permanently
is "interfering with the magnetic field". I find this hard to believe, but
physics was a long time ago.'
That sounds like pseudo-scientific cruft. You should find it hard to
believe.
HTH
Kevin
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