PoE is 48V, so you might consider that.  Remember that your going to lose voltage as you push it around, thats a good reason to use 48V and buck it down (or linear..whatever).  I actually used 24VAC not DC in my house.


--- On Wed, 6/25/08, Dario Greggio <adpm.to@inwind.it> wrote:

> From: Dario Greggio <adpm.to@inwind.it>
> Subject: [EE] 12 or 24V?
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Date: Wednesday, June 25, 2008, 11:33 AM
> Just asking a... generic question:
> I planned to have (as I already did in my previous home) 12
> or 24Vcc 
> around the house to be used for remote device, small
> actuators and such.
> 
> I'll also have 12V (traditional supply - no switching)
> for audio, using 
> 2x0.50 + 4x0.22 shielded cable.
> 
> But, the other one, will go around via CAT5e cable, using a
> 
> similar-to-PoE standard, powered via a 2.5A switching
> supply.
> I'm just wondering if it's better 12 or 24V...
> 
> The remote devices are PIC16F628 or 18F1320 based... @5V. A
> linear 
> regulator with a small dissipator is ok (tested for years
> @24V).
> I just believe that I may never need 24V - it would be most
> needed in 
> industrial field, not at home...
> 
> But, still, I'm left undecided...
> 
> -- 
> Ciao, Dario -- ADPM Synthesis sas -- http://www.adpm.tk
> -- 
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