At this time there is no OS board that will do 4A bipolar or higher. That is one of my goals this winter. Just today I received a 4A nema 34 motor to be a test bed. I just have one almost ready that will do 3.5A continious 4A peak. Full step or half step, chopped current limiting. I took a little different design path with. It has both the 10 pin IDC connector for interoperability with the other OS boards, but also has a 5pin screw terminal that can be intalled for discrete wiring. Also put opto isolation on the step, direction and enable lines, and they have signal conditioning in front so they should be ok with laptops. Just need to come up with some bucks to get a prototype pcb. It is a double sided pcb, not what I would consider toner transfer capable. Pic attached.
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Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com |