Re: 3 axis allegro 3977 stepper motor board

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "stokessd" <stokes@s...>
wrote:

> I've designed a simple 3 axis stepper motor driver board based

around the allegro

> 3977 microstepping controller chip. I'll be glad to share my

design (although it's very

> simple) with anyone interested.
>
> the 3977 is an interesting chip and the microstepping can improve

motion, but my

> experience with PWM motor controllers hasn't been great (I've used

the newport

> motion master 4000 for years in the lab). So I'm seriously

considering designing a

> half-stepping controller with current sources instead of ballast

resistors (and FET pass

> transistors).
>
> However this board has worked well for me on the bench, even though

it sprays noise

> all over the place. Here's a few pictures of it :
>
>
> http://www.quadesl.com/cnc/allegro_3axis/DSC00288.jpg

Nice pictures and a nice board.

Can you elaborate on the noise to which you speak ?

Of course another question is about the schematic, is that available ?

Dave

> http://www.quadesl.com/cnc/allegro_3axis/DSC00289.jpg
> http://www.quadesl.com/cnc/allegro_3axis/DSC00290.jpg
> http://www.quadesl.com/cnc/allegro_3axis/DSC00291.jpg
>
>
> Sheldon