On Tue, 30 Oct 2007 23:04:05 -0700, Leigh L Klotz, Jr. wrote:
>I showed him a similar LV lighting system I
>have (no dimmer though) and how it was 100% quiet with a transformer.
The "electronic transformers" are NASTY RFI generators -- they're
really switching power supplies. The only fix I know of (short of
replacing them) is to add a REALLY GOOD RF filter between them and the
power line. The filter must go right next to the "electronic
transformer" and the case of the filter ("ground") must have a VERY
short bond to the case of the "electronic transformer." The SAFETY
GROUND must, of course, be carried through the filter, but a connection
to EARTH is not part of the solution to the problem. The filter keeps
the noise off the power line so that it can't radiate.
BTW -- I see you're in Palo Alto. HSC (Halted) has a great collection
of power line filters at very low prices. The practical problem with
all of this is that most electrical backboxes don't have room to mount
them effectively (nor to house a transformer big enough to run the
lights).
73,
Jim K9YC
Santa Cruz
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