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Thanks for the feedback Guys, that Linistepper and easydriver PCBs looks very interesting, at least I would only need to drop in another PCB without a full redesign, and it does micro stepping. I wasnt aware of these, will look at them.
As Bojan says, you CAN use a bipolar driver on unisteppers, I just connected the central taps to B+, that was easy. The use of an H bridge doesnt matter, its just the high side drivers arent used (or that IS a problem, when the high side driver is on and the bottom one off, that coil is not now powered, but it is shorted, this doesnt happen with single ended drivers,mmmm).
Im still none the wiser then, perhaps the sequence is wrong, needs more current, high side drivers shorting, use of a 12v motor on 12v supply, dunno, will experiment more.
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