Ryan;

This subject came up just a few weeks ago.  The relay contacts are
generating EMI with a spark.  You need to use a snubber, just a cap, or
some other means to quench the arc on the contacts.  See the archive.

Chris Eddy

Ryan Miller wrote:

> I have a board that I recently redesigned that contains nine
> T90 relays that switch 110VAC. The board goes in an