I stacked 4 axos on top of each other and connected their power pins (big fat 1mm copper wires). I power the axobank from a decent 1500mAh, 12V power supply.
I also bridged the MIDI-in pins, so If I connect one DIN midi-in, all axo's are connected.
This all works great, but I have a digital hum
So I started measuring, and I found something weird:
if I put my multimeter in the "beep" mode, WHILE AXOS POWERED ON
BLACK probe on the case, RED on axo GND multimeter is beeping
you can see in the video that when I'm pulling the axo to make contact with the case... it beeps.
RED probe on the case, BLACK probe on Axo GND (any) multimeter silent
WHILE AXOS POWERED OFF
always connectivity (beeping)
the sound you hear goes away when making contact between Axo and case. You see me pushing the power plug in de video, I thought it was the plug, but it happens anywahere I push the axo.
Should I just solder the case to the axo GND?
is this a good idea?