Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Was Chopper circuit - Now ver 3.2, G298

----- Original Message -----
From: "Scott M. Thomas" <scott@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
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@...]
> Sent: Tuesday, April 09, 2002 9:05 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> 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.
>