I'm monitoring five external lines for change in voltage level with the 74's
ADC but have to consider the effects of induced voltage from lightning
strikes.  I was thinking of using either MOV's or optoisolators but I'm not
very familar with either.

A couple of points I need to consider is that I need precise mesurements
from the ADC so devices that affect the reading are not desirable and the
amount of induced voltage and current from a nearby lightning strike (in the
magnitude of thousands of volts).


Any pointers to information or suggestions would be appreciated.

Thanks
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Wayne Bennett
Griffith University
Brisbane Australia
w.bennett@sct.gu.edu.au