Power supply conflicts solved. I built a linear power supply for my PBS2D and had set the supply to exactly 5.00V When I used the DAC with a USB connection to a PC it was fine initially then might judder the sound until I disconnected the linear supply. I used a PC Probe utility to find the PCs 5v rail was running at 5.04 V So I set the linear supply to 5.07V Result problem solved. I guess the PB2SD was confused over which supply to use.
Hello,
How do you find out which supply is in use?
The S2 has a green icon on the top left corner of the display. I presume that if the icon is present, then the S2 is supplied by the external power.
My question is, it is possible that even if the external power is present (plugged) the S2 uses the usb port power? Which could be the condition for S2 to switch from usb power to external power?
As you noted the condition could be the higher voltage.
I'm using the S2 powered by an iFi power supply and a Mac Mini as source, but I can hear no difference with or without the external power supply. I'm using the iFi power only because I already owned it and some people have found that improves the sound.
It's an interesting thing...if I pull the iFi out of the wall socket, while S2 is playing, the S2 restarts and uses the Mac Mini usb power...if I play the same setup, but unplug the micro usb from S2 side (iFi plugged in the wall socket), the S2 keeps playing with no interruption.
As I already noted in another post, the Mac Mini delivers power through the usb even when is shutted down, so the S2 is always powered on.