![]() It is a no-go-system for audio for decades, but directly implemented from computer industry where it works just fine. ![]() You cannot get the plus voltage clean enough without decouple to zero ground and polluting it too. The biggest problem is that compared to analogue side, where low level signals almost without exception are balanced class A, the digital side have not yet understod that the hardest way to feed sensitive cicuitry is plus voltage to zero ground. Further with a housing of acrylic, the circuitry lays wide open for airborn RFI.Here you will have to trust me, this is exactly what I do for a living, scrutinizing power supplies for utmost silence and stability. But it is the power supply, there are no efficient enough onboard power supplies on these singel card computers, I am afraid. ![]() In your comment number two above, the problem is not the digital signal leads, they are as you say isolated by pulse transformer. ![]() Have to fix a solution like the one you propose. ![]()
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