Re: Analog Opto Isolator?

How about a big zener diode?
--
Phil Mattison
http://www.ohmikron.com/
Motors::Drivers::Controllers::Software

----- Original Message -----
From: vrsculptor <vrsculptor@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, September 24, 2007 2:36 PM
Subject: [CAD_CAM_EDM_DRO] Analog Opto Isolator?


> Hi,
> I'm messing with a very basic RC EDM (Jon Eleson's) and want to
> measure the voltage drop across a resistor using a micro (coridium
> Armite) with an analog 5 volt input to sense the spark gap. The EDM
> voltage is adjustable so I can't use a fixed resistor network to keep
> the sense voltage within 5 volts. I need some form of isolation to
> protect the micro from over voltage on the sense line after adjusting
> the EDM voltage. I don't need anything automatic as I can manually
> re-adjust a pot on the sense line to get the voltage back into range
> after adjusting the EDM voltage. I'm looking for something simple.
>
> Any suggestions? Is there such a thing as an input voltage tolerant
> analog opto-isolator? An i2c A/D with isolation and over voltage
> protection?
>
> Roger
>
>
>
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