(Just look at the schematic view in the Fritzing attachment. I should 
probably have posted differently.)

On Sunday, September 2, 2018 at 6:37:25 AM UTC-7, Fred Kerr wrote:
>
> Hello all,
>
> How should the 1.8V ADC (and other) pins be protected? One method may be 
> the attached, voltage divider of 1M/100K then limited by two diodes in 
> series. (Not tested, just paper design currently.)
>
> I'd like to explore other methods or suggestions. I have some old or 
> obsolete parts that I can use with info from data sheets. But it'd be nice 
> to go "modern".
>
> What about VCO to optoisolator? (Think of hostile / automotive 
> applications.)
>
> Suggestions: Circuits, books, URLs?
>
> Thanks!
>
> Fred Kerr
>

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