Xiaofan Chen wrote:

> Say if you have a single-stage buck converter, the efficiency from
> 24V->5V will be better than 48V->5V. 12V-->5V is even better.

As I wrote in reply to Olin, this enforces the 12V solution - especially 
since I'm kind of bound to Linear regulators.

But the 24V would possibly give e more "headroom" in case where I had 
long cabling and needed some more current...

The good part is that I can change from 12 to 24 almost on the fly, if I 
ever need it... since the only hard-soldered part on the "little boards" 
is one small relay - used for cases where a "dry contact" is needed.

-- 
Ciao, Dario
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