Hello,
I have a project where 3 DC motors are being pulse width modulated through each their own H bridge.
In addition to that, 3 ebows are turned on/off with transistors and 3 5v solenoids are being turned on/off (50ms speed and quite often) with each their own relay.
Everything is controlled by potentiometer knobs, and everything works fine EXCEPT one of the knobs (for the solenoids) cause all the other motors to glitch out when I turn that specific knob all the way up (meaning the solenoid goes very fast)..
I tried putting diodes across all 3 solenoid coils, but this just killed them completely.
I find it really odd that it's just one of the pots creating this issue, since all 3 pots/solenoids are wired up exactly the same way with the same components.
If anyone has any ideas what this might be - just any clue - it would be much appreciated 
Thank you
/Søren