I've had one a few weeks, I believe it comes with a 12v SMPS, it's a wall wart anyway. Strangely when I substitute it for a Maplin regulated PSU set to 12v, I get a lot of distortion when I play music. You can just recognise the tune underneath the noise but it's horrible. The PSU has worked nicely with other 12v dacs in the past.
Wondering if the polarity was the wrong way round, I first measured my PSU, 12v centre positive, then the SMPS. Nothing, a few mV randomly in either direction as the pins touched. Can you not measure the voltage across a SMPS with a standard multimeter? What could be going on here?
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