Re: A Question to MARISS

Dave,

You are absolutely right. Furthermore, driving an opto with an opto
is bad news. Optos have very poor rise and fall times. That is the
last thing you want in a noisy enviroment; any noise that
is "sitting" on top of a leisurely rise / fall time will probably
take that input thru its threshold multiple times. That is noise
generated extra step pulses. You have to have crisp edges, (very fast
rise and fall times) to be noise-free.

Mariss

--- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...> wrote:
> If the Gecko's have opto isolated inputs, why the duplication ?
>
> of course you may want to do that for relays with coolant and such.
>
> Dave
>
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Peter" <prenolds@s...> wrote:
> > Hi Raul,
> >
> > I'm working on a similar project with Indexer and G-Code
> controller. I
> > designed an opto-isolation printed circuit to isolate all the
> signals
> > between PC parallel ports and Gecko based controller box. You
> > might have to do the same. I power one side of the optos from
the
> > PC 5V rail and the other side from my contoller.