28 May
2010
28 May
'10
8:22 p.m.
Veronica Merryfield wrote:
USB power source very often breaks down and regulation isn't filtering.
The 100 Hz
(being 2x 50Hz, the power freq. in Italy)
suggests that it is probably related to some manner of
power supply. However, I have no theory why we're
getting 2x 50Hz (and I think I need one :-)).
The implication has been that the USB audio device is a cheaper device. It is therefore
more likely that the device runs from the USB 5 volt line than have a separate power
supply, and that 5v line is regulated and therefore less likely to have a power line
ripple on it.