Re: Buzzing relays? Anyone help?

["David" <clayt_d01@xxxxxxxxxxx>]

--- In ukha_d@xxxxxxx, mailinglists <mailinglists@v...> wrote:
> After a successful install of my automated hot water/central
heating
> controls (with many thanks to Neil Fuller for his donation of a
foot of
> DIN rail to securely mount the relays!), I've just noticed a small
but
> annoying problem.
>
> The relays buzz slightly when they are off. The installation is
> basically two big 240V relays connected into the CH/HW wiring, the
> relays have 240V coils that are switched by a pair of X10 appliance
> modules due to the distance between the server and the airing
cupboard.
>
> At a guess I'd say that the leakage current from the modules is
enough
> to make coils buzz. The problem is exacerbated by the relays being
on
> one side of a plasterboard partition wall, which seems to amplify
the
> buzz into the next room. Aside from the buzz everything else seems
to
> have worked just fine for the last few weeks.
>
> The $64K question is how to stop the buzz? Any ideas?
>
> Lee