Stepper Motor Question

[rkauer]

I could only give a physics lesson: you could't read impedance directly from a multimeter!

Impedance isn't just resistance (DC measure of a circuit).
It's a formula, calculated when the circuit is under AC current/voltage:

Z=U/I , where

Z = impedance, in Ohms
U = potencial difference (=voltage), in Volts RMS
I = current, in Àmperes RMS

Need to say the Z change under different frequencies, in most of the cases. Only PURE resistors don't change impedance over different frequencies (R=Z).

Maybe I'm just teachy, but maybe helps.

[rkauer]

You could use an ordinary regular lamp as load. Put it in the output PS and then read the voltage in the multimeter.

A good regulator for a very wide range aplications is the 78xx series (but its maximum current is 1A). All do you need is a 7806 and two caps AFTER the regulator: a electrolithic  about 470uF, and a ceramic one (100 nF is enough).

Need a diagram?