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12v not enough

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I've built a 3' C-Beam Actuator and I don't think the 12v power supply (1.6 amps) is sending enough amps to the GRBL shield on the Arduino as the machine seems to be laboring under a strain.

Before I go out and buy a 24V power supply, I'd like to know if a Maplins DC regulated power supply would be able to drive the 3 steppers instead. It puts out 13.8V at 3 amps continuous.

This thing is up on a shelf doing nothing, but I'm not sure the amps are too much for the board.

Thanks a lot....

12v not enough

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