Olin Lathrop wrote:

> I would use the highest you can get away with and stay under the regulatory
> limit where anyone cares.  I think that is 48V around here, but I haven't
> really looked.

Yep, this is one possibility...

> If allowed, 48VDC sounds like a good tradeoff.  It is low enough to be safe
> in most circumstances, but high enough that you significantly cut down the
> size of the conductor for the same power delivered.  Put a small buck

This is true: though I wonder: I'm "always" draining 50mA @5V, so, would 
it make any difference?

> regulator on the front end of all devices.  60V transistors are still small,
> cheap, and efficient, so this will be easy to do.  Even a poor buck switcher
> will be more efficient than linearly regulating 12V down to 5V.  48V is also

I agree, but the board are already there with their 7805, which does its 
job well enough.

(more in other replies)


But, besides, since I'm not really doing PoE and I may only need 24V for 
solenoids or small motors... the 48V seems out of question IMO...

-- 
Ciao, Dario
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