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Usefullness of a external quality power (linear PSU or Battery) for USB Pci card (SOTM, PPA,...) for use with an Asynchronous, completely 5V decoupled DAC ?


malarz

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EVERYTHING MATTERS

 

+1

 

How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

PROFILE UPDATED 13-11-2020

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This makes total sense, as those two different outputs likely provide some degree of isolation between the two feeds. If one just connects a single supply to both the MoBo and the USB card, the noise from the MoBo (actually the modulation of the power supply caused by the high speed switching components on the MoBo) will feed back and be shared to the USB card via the power supply wiring, no matter what type of supply it is.

Surprisingly, even then it doesn't give the same degree of isolation as 2 separate PSUs. I found this when I decided to put two +5V linear PSU PCBs with JLH Add-ons in the same case , but using separate transformer secondary windings. They didn't sound as quite as good as 2 separate PSUs.

 

Alex

 

How a Digital Audio file sounds, or a Digital Video file looks, is governed to a large extent by the Power Supply area. All that Identical Checksums gives is the possibility of REGENERATING the file to close to that of the original file.

PROFILE UPDATED 13-11-2020

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