I want to connect this dv motor to the 5V output of an Arduino board. Of course I need to get the 5V down to 3V in order for the motor to function correctly. I've read that I could use a diode with the correct voltage drop for this, or just use a resistor.
Going the resistor way, I've got some trouble figuring out the correct resistor value.
From the datasheet I calculated that the resistance of this motor would be 40ohms at 3V (3 / 0.075 = 40). Is this correct?
The ratio between 5V and 3V is 0.6. So I figured I need a (40 * 0.6) = 24ohm resistor to get the correct voltage over the motor.
Are these calculations correct? I'm still an electronics beginner so I'm not quite sure :). And even if they are correct, would I be better of using a diode (or maybe even a voltage regulator)?