just got my 2host built which is super exciting, but I’m noticing that when I am sending midi clock from ableton into norns, I can hear it a bit. it’s definitely the clock as it is in ratio to the tempo transport set in live (a lot faster probably 12ppqn or whatever)
no clock, no noise:
clock going in, monitor at 0 in levels, low noise
change monitor to 100% in levels, higher noise
eng at 100% for reference when monitor is at 0% (if you turned your speakers up for the others, turn them to normal levels for this one)
Are there ways to mitigate noise from the clock going into the usb port? If not, what would be some other approaches of clocking norns from ableton?
@okyeron@tehn I found some other micro usb cables that seemed to work better (noise still there but reduced in amplitude). It did not seem like power adapter plugged into norns vs. not changed the noise.
For a second there I was also getting noise from my (non-factory-issued) wifi adapter…norns audio out stopped working very briefly (maybe plugging in and out the wi-fi adapter caused norns to wig out?), I rebooted norns, and the additional wifi adapter noise stopped happening.
oh, apologies - my brain read that and thought about the ‘iconnect’ things.
but anyways… i do not see a schematic for 2host in the repo, but… from the layout it looks like the teensys are sharing a ground, no? therefore the norns and host USB shields are effectively connected? this is what i mean.
if that’s not the case then i can only imagine we are not giving enough current to the teensy that is supplied by norns host port. seems unlikely, LC consumption should peak at 50ma or less.
yes, it seems to me like a bad idea for noise issues, defeats one of the points of optoisolation (the other is protection against over-current / over-voltage,) and i can’t think of a great reason for it. (but it is hard to reason about it w/o schematic)