I do think that full galvonic isolation helps seperate what can be a very noisy PC envoironment from the rest of the reproduction chain, I think it is good engineering practice.
Can hear differences but cant measure them.. NOPE, when I see a definitive set of data I will change my view, but especialy with todays measuring equipement, if there is a change it will be measurable.
Can hear differences but cant measure them.. NOPE, when I see a definitive set of data I will change my view, but especialy with todays measuring equipement, if there is a change it will be measurable.
The ADuM4160 operates with bus voltage on either side. If use voltage from up side, is it full galvonic isolation?
Sorry, I can't understand your question. Are you asking if you can use the same supply for both sides? If so you can - but you defeat the isolation 😀
There're some plots up on ExaDevices site which show the difference isolation makes to the noise level - quite interesting (scroll down about half way):
exaSound Audio Design > e20 DAC > Measurements
I suspect it can use power from computer may not fully isolated. If use external power, is it fully isolated?
It depends where the external power comes from. If external power is from a battery then I'd say you've got full isolation. If external power comes from the mains then your isolation is only as good as the isolation in that mains supply.
ADum5000 transfer isolated power. Is this can use power from computer side still isolated?
Big trouble.
ADum4160 has low power consumption. Using battery may be OK, but all other equipment from DAC to power amp use mains. Is there still isolated?
The key is - drop the aim of getting 'total isolation' and settle for 'enough isolation'. We can do some modelling and experiments to determine how much is 'enough'.
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