Re: High voltage protection for a breakout board.

Alan,

Opto-Isolation is to protect the computer from the extreme high
voltages stepper drivers handle(yes, I know geckos have opto-
isolators, there are other drivers that don´t).

I understand your opinion with regards to breakout boards. I myself
have setup machines without them. But it makes things easier and
safer to setup. This breakout board I hope to price it the 20 to 30
range, making it affordable to any budget.

Thanks,

Arturo Duncan

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Alan Marconett" <KM6VV@a...>
wrote:

> Hi Arturo,
>
> How about 80VDC? That's what and opto-isolator is designed to

isolate

> against. A buffer will help if the drive current (from, say, a

laptop) is

> weak. I haven't heard of any need for a bidirectional buffer.
>
> I've built four driver/PS boxes, and haven't found the need for a

breakout

> board. My Geckos have opto-isolation already.
>
> Alan KM6VV
>
>
> > -----Original Message-----
> > From: CAD_CAM_EDM_DRO@yahoogroups.com
> > [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Arturo E.

Duncan

> > Sent: Wednesday, May 04, 2005 10:29 AM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: [CAD_CAM_EDM_DRO] High voltage protection for a breakout

board.

> >
> > Group,
> >
> > I have been working a design for a new breakout board for general

use

> > in cnc applications. The new design is based on the SN74LV245AT

IC,

> > wicth acts as a bi-directional buffer and has ESD (Electro Static
> > Discharge) protection for up to 2000V. I have been hoping to
> > eliminate the opto-isolators with the use of these IC, and will
> > greatly reduce the number of parts and simply assemble, thus

enabling

> > the possibility to reduce the cost of the final product.
> >
> > I know for most interfacing applications this IC is a great

buffering

> > device, but ¿would it be good enough protection from a possible
> > failure of a stepper driver?
> >
> > The datasheet for this IC can be found at :
> > http://www.cnc4pc.com/Tech_Docs/sn74lv245at.pdf
> >
> > Thanks,
> >
> > Arturo Duncan
> >