> You can also use a zener to drop a few volts from the input supply.

A few volts? In my case the input can be as low as maybe 16V, and as 
high as maybe 29V. That makes it a bit tricky to choose the zener.

But, as said, there are 7805 variants that can handle 35V, which is 
exactly what I was hoping for.

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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