[sdiy] input buffer question

[David G. Dixon]

> > The best diodes to use in this case are Schottky diodes because of
> > their lower voltage drop, but I can't see why they would be
> > significantly
> > better than regular diodes.
> 
> Regular diode drop is about 0.6 to 0.7V.  Schottky about 0.3 to
> 0.4V.  So if the AbsMax sates V+ + 0.3 then a regular diode would
> violate that limit and the op-amp would/could/maybe go into phase
> reversal.

Neil, I'm using the diodes in the opposite direction, on the "inside" of the
rails.  Hence, assuming diode drops of 0.7V, then my inputs are limited to
+/-14.3V.  This is more for spike protection than for phase reversal
protection.