Re: Re: Was Chopper circuit - Now ver 3.2, G298

--- In CAD_CAM_EDM_DRO@y..., "Paul R. Hvidston" <paulh@u...> wrote:
> Scott-
>
> But that _is_ a DAC ;-)
>
> Paul R. Hvidston, N6MGN
> ACKSYS Engineering
> Upland, CA
>
> ----- Original Message -----
> From: "Scott M. Thomas" <scott@d...>
> To: <CAD_CAM_EDM_DRO@y...>
> Sent: Friday, April 12, 2002 6:36 AM
> Subject: RE: [CAD_CAM_EDM_DRO] Re: Re: Re: Was Chopper circuit -
Now ver
> 3.2, G298
>
>
> > I have even seen PIC's with comparators built in!
> >
> > -----Original Message-----
> > From: Alan Rothenbush [mailto:beer@s...]
> > Sent: Tuesday, April 09, 2002 9:05 PM
> > To: CAD_CAM_EDM_DRO@y...
> > Subject: [CAD_CAM_EDM_DRO] Re: Re: Re: Was Chopper circuit - Now
ver
> > 3.2, G298
> >
> >
> > >
> > > Why bother with a PIC for a L297 replacement, unless you wanted
to add
> > some
> > > rudimentary microstep capability? Would a PIC be cheaper? The
L297 can
> do
> > > half-step and full-step, but adding microstepping would require
a DAC
> and
> > > control logic.
> >
> > I'm in the middle of a project that uses a PIC to drive a 3776.
It uses
> > simple 2% resistors to generate 1/2 - 1/4 - 1/8 steps. No DAC
required.
> > This would be an add-on for DanM's 5A controller.
> >