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Distored sound with external DIY DAC

Hi,

i'm wondering why a FiiO 3DK external DAC is working on HifiBerry Digi+ (transformer version) without problems and with a DIY DAC (CS8412 receiver circuit and a TDA1545A DAC chip) the sound is distored over S/PDIF coaxial ?

On the other hand my DIY DAC and the FiiO 3Dk is working without problems on a "standard" CD-Player.

Is S/PDIF from HifiBerry Digi+ different to a S/PDIF from a "standard" CD-Player ?
Maybe it is a grounding problem or something else ?

Best regards,

leuchtipi

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