> The spec on the IC says that there can be no
> more than 5V between the two references, so this means that I must
> make sure that the inductive spike is no greater than 5V. I have had
> ICs die for apparently this reason (latch-up).

Wouldn't it be a good idea to use an optocoupler (6N137) to isolate the
two circuits? 

Wouter van Ooijen

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