Re: Was Chopper circuit - Now ver 3.2, G298

Hi Paul,

Just thinking; I recall someone on the list that has already replaced
the 'L297 with a PIC. And the PIC could be the heart of a single axis
"jogger", for a 4th axis rotary table, for example. Kinda like
Sherline's controller? (Bill's ears perk up). I don't know if it's any
cheaper, but some things like limit and E-stop switches could be built
in. Same for PAL (or eqv).

Sure, we need a 3 or 4 axis 'L297 board now! 1/2 step is fine, might
not even want to bother with full step.

Yeah, I really like the G210's. And a pair of G340's is my next PLANNED
acquisition!

Alan KM6VV


"Paul R. Hvidston" wrote:

>
> Hi Alan,
>
> 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 guess a PIC could replace the L297 and microstep control
> logic. I see the "G298" as a wonderful way to easily get a powerful
> half-step driver going very economically. If you want max performance at a
> great price, the G210 is still the way to go. How 'bout developing a
> double-sided PC board for the L297 circuitry?
>
> Now since the H-Bridge is essentially the same on a stepper- and on a
> servo-driver, I would love to play with a PIC as a servo controller feeding
> half a "G298". Still, not as much bang-for-the-buck as compared to the G320,
> but still, the bare "G298" fills a market need.
>
> Let's see, could I up the switching frequency and use the "G298" as the
> power stage for a class-D stereo audio amp? Probably not, but I'm having
> lots of fun just thinking of ways to use a "G298" ;-)
>
> Regards,
>
> Paul R. Hvidston, N6MGN
> ACKSYS Engineering
> Upland, CA
>
> ----- Original Message -----
> From: "Alan Marconett KM6VV" <KM6VV@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, April 09, 2002 11:47 AM
> Subject: [CAD_CAM_EDM_DRO] Re: Was Chopper circuit - Now ver 3.2, G298
>
> > Hi Mariss, Paul,
> >
> > Yes! It does sound like an interesting project. Now all we have to do
> > is "publish" a simple plan (and code) for a PIC or PAL replacement for
> > the '97.
> >
> > Alan KM6VV