Hi tomb,   Apologies for not replying for a long time, I only got around to looking at the pupdac again today. And I figured out what it was. The noise comes from my wifi signal.. As soon as I dropped the output power of the router, the noise from the pupdac was completely gone. If I...

I've checked around the opamp and I can't see anything that might be shorting.. I'll trim the leads a bit closer to the joints. Could you please tell me if there should be a voltage across the mica caps? they both have 130mV on both sides of the cap, reference to ground. (and 0V across the...

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Thanks for the advice TomB.. I cleaned the board with flux cleaner and deionised water, let it dry under a bulb for about 12hrs.. the problem is still there.. On the PCM1794, There's a bridge on pins 11 and 12, I've scratched the soldermask on the via next to these pads so it's impossible to...

Hi Guys, I just finished building a pupdac and a doodlebug. I'm having some issues with the pupdac, and was hoping someone could point me in the right direction to fix it.   The dac gets detected by windows and audio plays through it, but there's a quite loud ticking or clicking noise with...