Before I went to Kazakhstan I drew up a schematic for an accelerometer board that we're going to be using with our safeguards hardware. While I was gone, they made up a layout and had some boards made. Last night i stuffed the first board and this morning I turned it on to find... it draws an amp. Ouch.
Careful review of the connectivity showed that the board electrically matched the schematic, and I verified that all of the parts were in the right places and soldered down well. But that op-amp sure was hot...
Prognosis:
The schematic has the rails of the op-amp chip reversed. Yeah. So that part is dead... Prepare for ugly jumper wires.
The bigger problem: I used the PDIP part for the AD637 RMS converter chips I'm using when I drew up the schematic. The layout person used the SOIC footprint for the board, which has a different pinout, but kept the pin numbering I had on the schematic. Ouch. 10 of the 16 pins on the chip are wrong, goo. Luckily, the way the power rails were coming in on this one probably didn't kill the chips. It'll just take... the ugliest modification in history to get it working.
boo.
You know, I can't tell if that's spam or not.
And when the post above is (invariably) deleted, I'd just like to let everyone know that there was some very not-Englishy spam-looking text above this comment.
It most certainly was. Some site in Portugal. WOo