Re: gEDA-user: powermeter board, with less ground planes :-)

[Joerg <joergsch@xxxxxxxxxxxxxxxxxxxxx>]

DJ Delorie wrote:
>> But a doorbell transformer is a whole lot cheaper than a PC.
> 
> Getting it into the panel upstairs might be tricky; the box is in a
> finished wall.  I guess I could just plop it inside the box.
> 

Of course, the super deluxe solution would be PoE but that is a recipe 
for project drag because now you'd have to add a litte switch-mode 
converter.

What we do in medical a lot where we need super patient isolation is 
ferrite transformers, choke, rectifier, linear regulator. That keeps it 
isolated, and in your case CAT5 has four pairs while you will only need 
two pairs per box. So ... you could even feed it from a wall wart 
(assuming you don't need a lot of power).


>> And with my wife the WAF for PCs next to the sub-panels would be
>> pretty low.
> 
> Two are in the basement, no problem there.  The third is in the
> playroom behind a bookcase, probably OK too.
> 
> Of course, with ethernet, I need a separate programming circuit.
> 

If they all got a different IP address wouldn't it work with just 
routers and hubs? The last 4:1 hub I bought was under $10, IIRC from 
Walmart. Plus a bootloader in the uC in case you need to re-flash that.


>> Still, I'd try to run CAT5 through the attic or raised foundation.
>> Cheaper, more reliable. However, I have no idea what the software
>> overhead would be for a LAN version of such a project.
> 
> My house is already wired for ethernet in pretty much every room,
> certainly near enough to the panels to run wire to them without having
> to go through walls.  One of the panels is right next to the patch
> panel and servers anyway.
> 

Then Ethernet would really be the ticket here.


>> Ethernet-equipped alarm clocks? Wow. We aren't this modern out here.
> 
> http://www.delorie.com/electronics/alarmclock/
> 

Oh man, with tongue&groove enclosure and the whole nine yards. Cool. But 
I wouldn't put 10uF tantalums in there, or any tantalums. At least not 
with a wooden cabinet ;-)

-- 
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.



_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user