now how critical the 3V limit is?
>
> The data sheet is a bit obscure but
> there is a test cct shown operating
> on 3.3V. Just wondering if using 3
> diodes to drop the Vcc would be OK?
> It's just that Vcc then becomes a
> little uncertain for different
> diodes. Would that upset things?
>
> Thnax - PJH

I've been using zener diodes to deal with the issue.

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