> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Steven Howes
> Sent: Friday, May 26, 2006 10:03 AM
>
> Hi, I was wondering if anyone here could work out why a 1A reed relay
> would 'stick' when carrying only 700ma.. It is only a low voltage (ie 2

Could be caused by transients created by the load switching on or off.
Transients from the load switching could easily exceed the voltage and/or
current rating of the contacts. Test the switching reliability with a very
low power load like an ohmmeter.

> or 3 v) so it is unlikely to be a power issue. The reed relay in
> question is an RS Electronics 291-9710. They appear to stick randomly
> then sometimes unstuck which seems a little odd. Is it possible that
> they were damaged during soldering? I have noticed most images of reed

Because these are completely encapsulated, soldering damage is much less
likely than with non-encapsulated types where you are directly soldering to
the leads that pass through the hermetically sealed glass. While it is
possible that they where damaged by heat it would have to be a extremely bad
soldering job. To test this, simply change the relay for a socket and test
the operation with new relays.

Paul

> relays online have them in sockets. Excuse my general stupidity but I
> have had little to do with these little bastar.... Components in the
> past. Thanks in advance for any help.
>
> Steve Howes
> Poundbury Systems Ltd.

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