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

[Mad Professor]

BillTodd: Thanks for your reply.

I am indeed going to use one LM317HV per phase, I should of made it more clear in my 1st post.

I am going to be using my Astrosyn MY103H702 stepper motors, thease have a max current of 1amp per phase.

I am intrested to know what caps to use to stop or limit any voltage noise.

As wile testing without any caps the stepper motor wile static will hum.

Thanks for your time.