[imhimmelkommter (Michael Toms)]

I am hoping someone on Ice In Space can help with a question to run a uni-polar stepper motor. The motor is 12VDC 3 Watts which would take 250mA. I would need to use limiting current resistors that 250mA is all that can be drawn by the motor. Some circuits I've seen have a formulae to use R (resistance in ohms) = Voltage of motor minus rated winding voltage (four windings) / Rated winding current. I guess the resistor to use would be 24 ohms at 3 watts each, would that be correct??

Can I join the two supplies as seen at the top of the circuit in red to use the one source for the 5 Volt regulator and the 12V to supply the motor.

I hope someone can help. Clear skies, Michael