On Tue, 2007-12-11 at 16:59 -0600, Stuart Rohre wrote:
> A number of methods might quieten a noisy relay.
> You might have to do some detective work to find out if the relay closing is
> being mechanically amplified by the chassis or panel upon which it mounts.
> Relays that have a bracket held to its surface by screws might use rubber
> grommets for isolation of the screws from the relay frame, and the frame
> from the chassis surface.
> Other ideas are to mount a rubber pad onto the chassis and then mount the
> relay to the pad. The stiffness of the rubber has to be experimentally
> determined to be of enough isolation to reduce the audio sound of the relay
> closing. Industrial rubber used for gaskets might make a suitable material.
> In a like manner, noisy fans on rigs have been quieted by use of rubber
> grommets, or gaskets upon which to remount the fan.
Hobby shops involved in RC models carry foam sheeting designed to
isolate the receivers from engine vibration. Those should be pretty good
at preventing relay noise from reaching the cabinet.
Gasket rubber may be too hard for good acoustical isolation.
73, Jerry, K0CQ
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