I meant to post this several months ago, but Ihtink I got sidetracked.
A quick google beta search di not reveal such a post, so if it is
a duplicate, sorry.

I HATE #%$^&*! wall warts, mainly because they are soruces of evil RFI.
The same techniques can be used on !ALL! power diodes. Such effort is
well worth the time and minor expense. I was able to really quiten the
RFI sources in our home.

http://home.computer.net/~pritch/shortwav.htm

Terry