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In Reply to: RE: thanks! one more here... posted by beppe61 on January 27, 2015 at 03:37:38:
I cut the power lines in a usb cable and a Cambridge Audio dacmagic is working the same
In which case, the DAC's Gnd is connected to the host's Gnd by some other route. USB's D+ and D- lines are a differential pair and work only where there's a Gnd connection as reference.
Whether the +5v line is needed for handshake purposes is a matter of design. Some DACs use it, others, inc mine, don't. There is perhaps a slight noise-reduction benefit in not using it but it's not a show-stopper.
as it should for all nicely designed dacs
Hmmmmm. See above.
HTH
Dave
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Follow Ups
- RE: thanks! one more here... - Ryelands 04:40:06 01/27/15 (1)
- RE: thanks! one more here... - beppe61 06:01:20 01/27/15 (0)
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