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RE: iPad and external DACs

"Obviously many devices fail on this feature."

Feature? Does the device in question have a separate power input besides the USB connection? In that case it at least could do it. However some designs use both. I think Ayre does for instance and runs the USB transceiver and some other glop from the host power then opto-isolates that from the self-powered chunk.

If not it would be unable to devine that the user has hacked up his interface to not draw power from the host which I believe was your test case.

Regards, Rick


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