Does anyone know of any relays that are quieter than an automotive style SPDT rela?. If not, any tricks on how to muffle the sound a little?
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How about mounting them on a circuit board and then use some upholstery foam rubber to mount them where you want. Use double stick tape to mount the circuit board to the foam and also to the mounting spot. Use the smallest amount of foam needed to make a positive bond.
Ron
In the pipe organ industry we use heavy felt to dampen the noise from relays. The relays pictured are mounted on a circuit board that has felt backing that is 1/8" to 1/4" thick. This is screwed to a board with felt isolation washers between the screw head and the circuit board. The mounting board also has a heavy felt backing. The relays are enclosed with a removable top. This is also lined with a sound deadening material, usually felt. This particular example used foam rubber which deteriorated over time. I try to avoid foam products for this reason.
This usually deadens most of the clicking associated with electro-mechanical relays.
Incidentally, these relays were salvaged from a pipe organ project and will be used on my train layout.
Tom
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It depends on how much current you need. Some of the smaller relays are very quiet, you have to get an ear near them to hear them transfer.
Those work well, but they do have about a 1.6 volt drop across them. That's not a problem for most uses, but might be a factor.
