DJ - On Tue, Oct 28, 2008 at 12:49:51PM -0700, Larry Doolittle wrote: > Your board looks decent. What kind of voltage resolution are you > looking for (e.g., what IC are Uxx0)?
I see now, ADE7753ARSZ, $3.834 in 25's at DigiKey. 16-bit Sigma-Delta under the hood. Good luck with that. > The first thing that leaps > out at me is the large loop for power supply filtering on those > chips (both AGND to AVdd, and DGND to DVdd). Oh, and do you really > want REF filtered to digital ground? No, you don't. > If you have noise troubles with that layout, I can offer suggestions > to improve it. Hint: it will involve more closely approximating a > real ground plane over the whole board. I guess your layout will need at least one more rev before you can get to the noise limit of that chip. OTOH, maybe that isn't the goal. I do really like the idea behind that board! I have a Kill-A-Watt at home. It's really handy, but a real multi-channel power datalogger would be even better. I thought about building one myself many years ago, but never got the traditional Round Tuit. Don't let my snarky comments about grounds keep you from building yours. - Larry _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user