RE: Common 12V power supply

["Richard" <rich_lists@xxxxxxxxxx>]

You have to check that they all have a common ground. Its quite
frequent
that you find a diode or fuse or something between the ground of the
circuitry and the negative of the power input.



You also run the risk of ground loops doing this, particually if one thing
has a switching regulator down to 3.3 volts in it and another is a piece of
audio or video gear that's sensitive to noise on its ground.



Think of all the problems with alternator whine you get on car audio and
then shift that into your server closet ;)



Otherwise look on ebay for some of the cctv camera supplies, they have
octopus cables or more with the normal DC plug size on the end from a nice
small switching power supply, sometimes with individual fuses as well.



From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Martyn Wendon
Sent: Monday, February 04, 2008 12:15 AM
To: ukha_d@xxxxxxx
Subject: [ukha_d] Common 12V power supply



Looking around my Node 0 there's about a dozen or so "wall-wart"
type PSUs
powering the likes of routers, switches, cctv cameras, etc.

Since all of these are 12V and have current ratings of between 300mA and 1A
is it possible to replace them all with a single 12V PSU that all the kit
can connect to?

It's got to be more effecient since the heat that the existing PSUs chuck
out must be a huge indication of how much power is wasted and it'll free up
a load of 240V sockets too.

I know that there's different types of PSU (switched, regulated, etc) so
has

anybody done anything similar and is there any off-the-shelf kit that can
do

the job?





[Non-text portions of this message have been removed]