I have a project with a few custom PCB driver boards driving 6 stepper motors each. The PCBs use both 12v and 3v. The screw terminals for the in/out power are rated at 10 amps and with each PCB pulling roughly 1.5-2 amps at peak (majority of this being 12v) I am daisy chaining 4 at most with the 12v power.
The 3v which comes from a buck converter powered via the 12v power supply should be able to daisy chain to all PCBs without causing any issues. However, im unsure what to do with the buck converters ground out. Do i just bring it back to the power supply? The screw terminals i have all are are a single in/out for 3v, ground, 12v so i wouldn't have another spot for the 3v ground wire to be installed.
Or should I possibly splice the 3v outgoing buck converter ground into 3 different 12v ground wires?
Picture for reference on what I'm guessing I could do?
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