Nick -

One thing to be aware of in using these controllers is that their
control voltage is isolated.  It is generated on their board and cannot
normally be connected to your system ground.  I ended up using some
little relays to change the polarity (direction) and some opto-isolators
to control the speed.  Of course the relays and optos were run from the
PIC.  

If you need more specifics, contact me off-list and I will dig up the
actual circuits we used.

  Foster


> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of James Nick Sears
> Sent: Friday, August 03, 2007 1:51 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE]: 90VDC Motor controller
> 
> Thanks everyone, as always, for the tips.  Definitely looking to buy,
> not build, here.  Looks like Minarik is the answer.
> 
> -n.
> 
> 
> On Aug 2, 2007, at 1:32 PM, adastra wrote:
> 
> > These folks make a line of motor controllers that have worked very
> > well
> > for me.
> >
> > http://www.minarik.com/
> >
> >   Foster
> >
> >
> >> -----Original Message-----
> >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> > Behalf
> >> Of James Nick Sears
> >> Sent: Thursday, August 02, 2007 10:27 AM
> >> To: Microcontroller discussion list - Public.
> >> Subject: [EE]: 90VDC Motor controller
> >>
> >> Hi, I need to control a pair of 1/20HP 90VDC motors with a PIC.  I
> >> need variable speed and direction, which I could do easily enough
> >> with an H-bridge, but I really don't have time to deal with the
> >> design of a motor controller.  Does anyone have a recommendation of
a
> >> power supply/motor controller that I could control easily from a
PIC?
> >>
> >> Thanks,
> >> -n.
> >> --
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