Hi Percival Sweetwater / Soundcheck Sorry But I have No Circuit description or diagram over the SBT. In my work as R&D HW engineer I have a lot knowlegde regarding RF and Digital circuits and the related components. This knowledge is what i'm been using for re-engineering the SBT. Please be aware of I have only made modifications for the SPDIF output and only for the Coax output, not on the analog section. I have also measured the Ripple of 5V Supply for the SPDIF optical transmitter and USB. For now, I have not spend time to reduce this ripple. I have only measured at the optical transmitter connector and this ripple is pretty big. I bet, that there will be improvements in sound stage if this ripple is reduced.
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