ar-t wrote: > Hope no one minds if I jump into an old thread, but.................. > > We get questions about things of this nature, all the time. So, if I may > be permitted, let me make this one observation. > > We have noticed, from time to time, there was a 60 Hz spur, in our phase > noise measurements. (Measuring and quantifying clocks is one of the main > tasks, in the other side of the business.) It would come and go, and we > had a hard time nailing down its cause. > > Turns out it was the 5 V wall warts, that we sometimes used to warm up > clocks, before sticking them in the main test fixture. > > The reason I point this out it is the same brand, and model, that > frequently comes with Squeezebox products. > > Granted, this noise is pretty far down, in the noise. But, it is there, > and we could occasionally see its effects. > > Can anyone hear this, on their Squeezebox? I dunno.............maybe, > maybe not. But, if we can measure it, the possibility exists that one > can hear it. > > For the record, other brands are as bad, or worse. Some models, of the > same manufacturer, are better. The SMPS we have looked at seem to be all > over the map, and there is no clear-cut good, or bad, brand/model. > > LPS have their own issues. > > The answer is there is no 100% correct answer. And we tossed a small > handful, of wall warts, just to be sure.
OK................another interruption, if you don't mind...................... Turns out some of our noise problems were also caused by the SMPS in our computer monitors. Solution to that problem turned out to be position of the monitor relative to our test gear. Sometimes turning it 90 degrees would fix it. Other times, it was more tricky to eliminate. As before: can anyone actually hear these effects? I'll give that a definite possibly maybe qualified "well, it depends." http://ar-t.co ------------------------------------------------------------------------ ar-t's Profile: http://forums.slimdevices.com/member.php?userid=13619 View this thread: http://forums.slimdevices.com/showthread.php?t=82648 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
