Won't your 33V Zener drop the input voltage to the regulator too low at the 
bottom end of the range? (i.e.: 36V - 33V = 3V).

-- Bob Ammerman
RAm Systems

----- Original Message ----- 
From: "M.L." <m@lkeng.net>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, April 23, 2010 10:47 AM
Subject: Re: measuring 36-72VDC


> On Fri, Apr 23, 2010 at 9:52 AM, Dario Greggio <adpm.to@inwind.it> wrote:
>
>> how do you like it?
>> :)
>>
>
> I hope you used a half-watt resistor for the 15k-ohm.
> I would have used a slow SOT-23 opamp and significantly larger resistors 
> so
> that I don't waste 1/3 of a watt for no reason.
> -- 
> Martin K.
> -- 
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