Hi,

I'm in the beginning stages of setting up a CNC router. I'm starting with some simple electronics then moving on to mechanicals and if I get that far I will probably go back and upgrade the electronics.

I have three Minebea steppers (2.3V, 2.3A, 1.8deg) and would like to drive them with the 179 unipolar stepper motor driver. It's a simple full step driver that has internal oscillator, or external control options.

I would like to drive the motors with a higher voltage (12V) but I am unsure how to calculate the current limiting resistor required. I have been looking through the forums but havn't yet been able to find the answer, I am sure it's simple.

Can anyone point me to the proper resource, or do some simple math for me?
It's an 8 wire unipolar motor and I have measured the coil resistances at 1.4 ohms for each coil.


Thanks alot.