Hi, I'm new to this forum, so if its the wrong section, excuse me.
I'm building a small cnc machine (20" by 25") using stepper motor and a psu salvageg from an old printer, the motor are unipolar motor (5 wire) and the psu has two output, one 12 volt and one 40 volt. The transformer on the psu is rated 15 amp. I build a small cuircuit using a couple of uln2003 I had lying around from old scanner and tested the motor using turbocnc using the 12 volt output of the psu. The motor where able to move the machine rater easily but the uln2003 would just die and literally go up in flame (and I mean literally, like in "poof" gone) after about 1 or 2 minute of operation, sometime less. I know thats because the amperage is too high on the psu but that was just for a test to see if the motor worked on the machine.
I did some research to find a suitable driver for my machine and found 2 that look like they would work. Money is an issue and I dont want to spend too mutch on driver since its only for a small project ( if it work great, maybe I will eventually invest more and build a bigger one, but not for now ). So, here are the two driver I found, one from hobbyCNC :
http://www.hobbycnc.com/products/hob...er-board-kits/
And those one from probotix :
http://www.probotix.com/stepper_moto...ers/ProboStep/
That need to be conected with that:
http://www.probotix.com/breakout_boards/pbx-2/
So, for a small project like that, should I go with the cheaper one form hobyCNC, or the one from probotix ? And would they work alright with the psu I salvaged from the printer ? If not, I also have a 24v 12amp psu I made from 2 computer power suply a while ago that work great. So, what do you think