> I'd look around on the net for a book called "Electronic Applications" by
> Bob Zulinski.  It's an online book in PDF format; I'm not sure where I
> found it.
>
> It has a very helpful section with extremely equation based methods for
> developing Schmitt trigger circuits, which is what you need.


You get it free by asking the author here

        http://tinyurl.com/sitq


        RM

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