Roman,

I find your 'real-world' experience to be invaluable, and I often apply
lessons learned from you.

Re: this input protection thread, I want you to know that what I really
looking for is the underlying 'why' and 'how', rather than just a 'never'.

Many designs are highly cost-limited, and adding a zener could make a big
difference. As I am sure you know, any sort of life-cycle cost analysis
requires understanding the relative costs of prevention and cure, and the
latter depends on failure rate. With a low-enough failure rate almost any
prevention expenditure is a waste of money.

Keep up the good work!

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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