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

["David C. Kerber" <dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of Joerg
> Sent: Tuesday, November 04, 2008 7:15 PM
> To: geda-user@xxxxxxxx
> Subject: Re: gEDA-user: powermeter board, with less ground planes :-)

....

> >> If by circuit panel box you mean the breaker box (or a sub-panel)
> >> legally you aren't supposed to do that AFAIK.
> >
> > I suspect you're right, but then again, I don't plan on these being
> > *that* permanent.  Ideally, they'd run off a transformer in the box
> > and use radio or fiber to get the data out, but radio won't pass
> > through a metal box that easily.
> >
>
> Theoretically you could use a doorbell transformer, some come
> in breaker-panel compliant sizes. For data USB needs a direct
> connection and if that's all the R8C got, what can you do?
> Ethernet would be isolated but I don't know what's out there
> on the market to isolate USB.
> I think WiQuest had that but AFAIK they are gone. Some
> robotics places might have modules.

B&B Electronics (www.bb-elec.com) has isolated usb hubs, as well as usb-to-ethernet and usb-to-RS232/485/422 converters that you might find useful.  We use a ton of their add-in serial cards.

----------------------------------
David Kerber
Warren Rogers Associates
(800)-972-7472 x-111
dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx
www.WarrenRogersAssociates.com
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