> And probably the easiest way to do it is a chip such as
> the Intersil HIP4080, or some of the other HIP408x family

I picked up a couple of those from RS the last time you
recommended them. They look very nice and would be
quite easy to control with s/w. As I recall they're like the
H-bridge equivalent of a stepper controller. This particular
H-bridge was already under way so I've not had a chance
to try the HIP4080 yet but it's certainly on the to-do list

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