Re: Analog Opto Isolator?

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
>