i am powering it via probably the shittiest possible usb-c cable. i wonder if getting a better cable would fix it.

this is a *server motherboard* ASRock. what are you even doing. why is there noise on the USB power rails.

@ariadne asrock are terrible at this. every board I've had from them has noisy USB with audio frequency garbage coupled from the CPU power rails. my guess is they run 4 layer and let return currents flow right under the USB bucks and I2S DAC in most of their designs.

@gsuberland @ariadne that, and USB VBUS is the second-worst voltage source that most people will use - the worst being automotive “12” volt

@jpm @ariadne true, but still, I've seen >400mVp-p audio frequency noise across VUSB/GND on one of their boards. no common mode filtering either. hot garbage.

@gsuberland @ariadne and I'm still seriously considering designing and building a USB VBUS fixer (as big an input cap as I can get away with, a 1MHz-class buck-boost converter in the middle, and as big an output capacitor as I can afford)

@jpm @gsuberland @ariadne the irony is we have this issue specifically with the server motherboards that a certain high end audio console manufacturer uses in their consoles (no actual USB audio devices, but issues with USB HID and MIDI devices due to noisy/saggy VBUS)

@s0 @gsuberland @ariadne speaking of your $DAYJOB, do you reckon they’d pay for a device called “The USB Power Unfuckenator” or should I workshop some more names?