Dennis Plunkett wrote:

> Now all you ahve to do is protect the OPTOS!

  Indeed.

  I have a problem with the generic recommendation of optocouplers.

  They are appropriate where the two circuits are isolated.  If however,
you are using them with one common line to both input and output as I
have seen in some suggestions, as a glorified transistor, then you have
misunderstood the problem and are bound to be disappointed.

  There are other, more effective ways to slow down the response of a
circuit!
--
  Cheers,
        Paul B.