DIY servo drive? was Re: stepper vs. servo

Hello,

Mariss is probably laughing right now, or at least has a "knowing"
grin across his face...

Having spent a LIFETIME in motor control, he makes it look easy. It
isn't...

There is a LOT to a servo drive... And the step-servos that Mariss
sells have an ENORMOUS capability for the meager price requested!
You are not likely to come ANYWHERE NEAR the performance of these
drives with a "grab the schematic and soldering iron" approach IMO!

But if you want to try:

The microchip applications notes page has a design that might get you
started using a pic and a small pld, with a National 18201 as the
driver...

Hope this helps,

Ballendo

P.S. Yes, for pure DC motor control, all you need is a bridge. (Some
mosfets, as you say.) But getting from there to reliable, accurate
servo operation is not a short trip... (I expect Jon E will concur<G>)


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Roy J. Tellason"
<rtellason@b...> wrote:

> On Monday 09 February 2004 11:17 pm, Albee Tang wrote:
>
> > By the way, instead of buying Gecko G320, can we just build one

using some

> > Power MOSFET construct it in H-Bridge? Wouldn't that be cheaper

than buying

> > a Gecko driver?
>
> If you know of a URL where one could find such plans, I'd sure

like to know

> about it...