Simple Current Limiter (LM317)

[BillTodd]

Since you can make a two terminal current source with a LM317 you could just put two in series to extend the voltage range.
(See Irving's example here:http://www.mycncuk.com/forums/attach...5&d=1247335598)

Be careful you don't exceed the chips power rating (i.e. check data sheet for maximum simultaneous voltage drop & current)

[edit] just saw this

I am going to be running 3 stepper motors in unipolor, so I am going to need 2 LM317HV's per stepper motor.

You really need to put a separate current limiter on each phase in a unipolar design else it'll run out of puff