Hey Gouwa, hey Stefan,
I’ve try to connect only the usb DP/DM signal (gpio pin 3/4 or 7/8 ) from the vim to the tone board and use an dedicated PSU, but i can’t get any signal. I’m use VIM1_Nougat_V180619 and install coreelec above. All is running exelent, if the tone board is directliy on the vim/vim2.
What do I wrong ?
If you use a dedicated PSU to vim and use the vim‘s GPIO power header to tone board，I think it’s not a good idea for tone board power supply.
If you use vim’s GPIO DM/DP and PSU for tone board with GPIO power header，you can improve the power quality theoretically.
In fact, the tone‘s power ripple control is good .