M.L. ha scritto:
> Also I don't really see how a 33 volt zener is going to allow your 78L05 to
> work from 36v to 72v. The abs. max of a 78L05 input is 35v and you want it
> to actually work at 39V.


That part is indeed a bit of cumbersome, Martin and Bob.
I may use a small DC-DC converter with a larger range. Again, I still 
stress the point that I'd have liked this circuit to be more cheap and 
"concise" as possible.

thanks
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