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Probably it is OK for normal USB devices but QA403 specifically requires I think >4.6V (and ~900mA). It still works with less than this but it is not recommend, I guess it is not designed or tested for that. Meanwhile I tested a few cables and there is a large difference. The cable that works the be...

I believe I did, it is not connected now so I cant check. Does the operation of relay indicate the AUX power being used ?

I am using a QA403 audio analyzer (USB 2) and it reports USB voltage and current (and warns if USB voltage is too low). With my PC, USB voltage is around 4.7V and the current between 0.8-0.9A. I see a very minor 50Hz component when looking at the FFT of its output and I wondered if this can be elimi...

I still cannot use the isolator with rpi4b, this time using moode audio on rpi4b with a denafrips DAC. Is there something I can do like updating firmware etc. ? By cannot use I mean moode audio does not see the DAC, without the isolator (direct connection) everything works fine. Update and some debu...

My Pi4B here is working perfectly fine. Maybe there is a USB-incompatibility in your setup. If you use "audiophile grade" USB cables, swap them with off-the-shelf gray USB cables just out of curiosity. You can also try a proper Computer (e.g. MacBook) with your DAC and the Intona isolator...

I have just received my 7055-C without seeing this post and stuck on the same issue with Pi4B (running ropieee). Any updates ?