Re: Analog Opto Isolator?

WhenI made my R/C EDM, I drove the electrode in about 1/4 as fast as
I would withdraw it.

What I found out was that you really need to eleminate any play in
the motion. I had a bit of sideways movemet, so the electrode would
short out and cause a full withdrawll.

If I was to do it again, I would count steps so I could do something
similar to peck drilling. Rapid out, clear, then rapid back in to
some distance short of the last known good posistion and start there.

Dave






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor" <vrsculptor@...>
wrote:

>
> Thanks all,
> I'm not an EE, just a hobbiest and a computer person. Your right

about

> the voltage range and the dividing. I missed that. I will give it a
> try with no isolation and a fixed network and see what happens.
>
> I've ordered the pieces and will let you know how it works out.
>
> Roger
>
> > I'm not sure I agree with your premise.
> >
> > If your spark is between 1 volt and 100 volts, with 100 volts

yielding

> > 5 volts to the sense line of your micro, your micro would easily

be

> > able to sense the voltage within one volt, no ?
> >
> > I think the real question is that of isolation. And, again, I am

not

> > sure I agree with your premise.
> >
> > the DC power supply to the micro needs to be rock solid, the

input is

> > supposed to fluctuate.
> >
> > Just tying the grounds together should be good enough.
> >
> > If you want more, consider using an op-amp after an opto. the op-

amp

> > would offer a means of offering you the ability to amplify your

signal.

> >
> > Also, with a slight bit of circuitry, you can use one pot to both
> > adjust the spark voltage and also re-range the sensor.
> >
> > Dave
> >
>