Dave Plowman (News) wrote:
Have a few devices in the AV setup which are USB 5v powered. To try and
keep things as neat as possible, all the mains to that are now IEC, as
that takes up less space than 13 amp.

So decided a USB power supply would be nice. One where the PS was internal
rather than a wall wart, and a main cable I could fit an IEC plug to.
Found one on Ebay with 8 outlets - not cheap either.

One of the things it would power being the a Toslink to phono adaptor -
TV audio into the amp. Which was just fine on its supplied 13 amp wall
wart. With a USB to USB lead.

I now get a noise like a distant burglar alarm on its output with the new
PS. ;-) Changed back to the original PS, OK.

Not a ground loop either. Happens with only it plugged in.


Depending on the loads, you could be simply over loading it and it cant
regulate properly.

Unless by your €˜Happens with only it plugged in comment you mean you still
hear it with, say, just your amplifier and speakers and no USB devices.
That suggests a the beast has an inherent noise problem. Price doesnt
always equate to quality in terms of noise performance BTW- plasma TVs were
very expensive but very electrically noisy.


What make is it? I find Anker ones are generally pretty good. I dont know
if they do an 8 way one but certainly a 4 way.