whoops, schematic's there, but the brd file is a zero-length file!
i would have to learn how to [reshape board outline] ... select two edges, right-mouse, select "stretch arc".
Grr. Google Drive apparently doesn't like firefox very much. Things went better with Chrome, and I've uploaded a combined .zip file...Draw new edge in "dimension" layer, use "miter" tool on corners. Delete old edge... (uploaded a "-rounded" version as well.")
i put the GND/Power clearance back to 8mil
the flood-fill changes if you alter the POW net class clearance!!!
is there a way to do *component* level DRC
I meant to do that, but I got tied up when I forgot which one(s) had always been 10mil, and forgot to look it up.I also didn't look at the DRC before changing things...
Hmm. Ok, thanks to the backup files.... ALL the signal clearances were at 8mil, and when we return to that the only DRC warnings are for the mounting holes (on both original and modified versions.)You can change the clearance of the flood separately from the signal clearance using the "change isolate x" command on the polygons. I like the way it looks with a 14mil "isolation" parameter - that's nicely separate, but still floods between the connector pins.
I don't think that it allows crystal-less USB operation, though. :-(
Sure fits nicely, though (SSOP20 vs SOL16, eh? Interesting the way that works out.)
flip/pinswap the reset switch so the reset signal doesn't have to snake around so much? Or is that intentional?
I'm a little worried about the uSD card having room to slide out...
Newer Arduinos have simplified the op-amp part to only use a single op-amp, which would theoretically permit use of a smaller package. (OTOH, they're using the send opamp as a buffer for the L led.)
UA741 http://www.ti.com/product/UA741 is $0.12 that's better....honestly the last time i used op-amps was at school, and that was... um... 1985? help!
that's what's in the PDF of the mega2560 schematic! damn it this sort of thing pisses me off: the reference design that arduino.cc released (the actual eagle files) are hopelessly out-of-date.
uncertain about what (low-er cost) single-channel op-amp to put in its place?
When and where did you get your copy? The versions I see now at https://store.arduino.cc/usa/arduino-mega-2560-rev3 look updated and current.
LMV321 ? Seems to be available from several vendors, and on ali-express for cheap. Beware the non-V version, which isn't a rail-to-rail-y.
uA741 is very old maybe in 1985 you used it !