On Fri, 28 May 2010, Veronica Merryfield wrote:
>
>> 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.
Yes, as I go back and read that A was proven by A... it
could be the power source for either device -- and most
likely the "cheaper" card A.
-gabriel
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Received on Sat May 29 00:15:07 2010
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