"Claude Hopper" wrote in message
...
Bob M wrote:
While trying to connect wireless speakers for the Xmas season I noticed
that
on the receiver end I get a distinct hmmmmmmmm. I tried different plugs
and turned off all the fluorescent lights I could find. Still there.
Also I don't think any appliances and/or chargers were functioning at the
time either.

Can some of you please suggest what other areas I might check?

Probably a leaky power supply. Or a really cheap one.


Some wireless speakers aren't designed all that well, and suffer from the
very problem you describe. Even good models, as they age, begin to suffer
this problem in some cases. The electrolytic capacitor(s) used to filter the
power supply get dry and provide less filtering. Can you try running them
off a battery supply or a known good source of DV to see if they still have
the problem? This would separate your problem as being either "conducted
EMI" versus "radiated EMI". Conducted comes from the power line or power
source / power supply whereas radiated comes from fluorescent lighting or
other nearby sources of RF interference.

Smarty