2009/10/8 Sven Wesley <svenne.d...@gmail.com>:

> Sounds like a very clean setup. Then it would be really easy to make an
> amplifier board (with opto isolation) that just enhance the signal, right?
> No need to by step/dir drivers then.

True, though we desicussed this on IRC a few days ago, and cradek
pointed out that you don't get the chopper-controlled current limits
that you have with a commercial driver, so either you run at motor
rated voltage and are limited to low speeds, or you have large banks
of resistors and capacitors to create a constant-current source in a
1970s style.

-- 
atp

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