I have attached the PCB layour for my PCM2606 USB sound card. If you want a schematic look at the PCM2906 datasheet, I have used the basic connection without a voltage regulator. The unit works perfectly well playing audio from the PC and also when I use the onboard ADC with the analog inputs (although the input volume seems rather low...but it measures as flat as possible with SpectraLab). The problem I have is that when I connect a digital source such as my NEC3XP+ cd player I get no sound. As I am new to digitla I was wondering if any of you digital gurus out there could help me out. Do I need some kind on filter on the input or something to change the signal level etc? Any help would be much appreciated.