I have a 5V (2A max.) circuit for multiple Attiny84s and a 12V (4A max.) circuit for stepper motors. Does my negative wire have to have a 6A current rating now? Or will I be able to use less?

12vDC 4A + 5vDC 2A negative wire current rating

DrDiettrich September 19, 2021, 10:18pm 3

Not necessarily but so you are on the safe side.

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