Re: [CAD_CAM_EDM_DRO] Delagrange stepper driver board

Scott Riddle wrote:

>Has anyone seen or heard anything about these driver boards? They can
>be seen at www.dtllc.com. I am looking at his 4 axis boards(uni-polar
>currently). He is working on a bi-polar one currently. My main
>question is, this driver is a L/R type and does not adjust the
>current
>to the motor as it goes faster. It is fixed with resistors. Will this
>give a very different performance than a chopper drive would? I
>really
>like the price and look of his uni-polar, 4 axis board. It is very
>clean and professional looking.
>
>

I'm pretty sure it IS an L/R drive. Stay away. The performance is going to
be HORRIBLE. And, if you try to run it with a 10 A/phase motor, the power
resistors to run it at any reasonable speed (like 300 RPM) will cost
more than
a couple of Gecko drives.

I also see no freewheeling diodes. There is no voltage rating on the
document,
but he notes that the series resistors are OPTIONAL! So, he really
intends you
to run four 4 A 2 V rated motors on a 32 A 2.0 V power supply. In such
a case, I
would be surprised to see you get more than 60 RPM out of size 34 motors.
This board is a joke, I'm sorry to say!

I can say with absolute certainty he has NEVER run anything bigger than some
steppers salvaged out of floppy drives on this, or he'd KNOW there was a
problem!

Jon