On Fri, May 18, 2012 at 11:13 AM, Werner Almesberger <[email protected] > wrote:
> would that default only to Power.sch ? Or to the whole > circuit ? applied to whole sheets now. > Ah, I meant the opposite: specify what part we use. Just "it's a > microphone" seems a bit generic. (At least to me.) > Okay, the part number is MP33125, enabled. > are you sure the pins in the connector are numbered like > this ? The data sheet says (left to right) 5-4-3-2-1, not > 3-5-2-4-1. > Two MIDI connectors if checking gerber files and schematic's pin numbers, the order should be like the one i edited it in KiCad. the datasheet is drawn indistinctly. The order is 3-5-2-4-1(front viewing) for real current m1 rc3 layout, if using a 5-4-3-2-1 numbering on footprint, which will not correct. this is yes, of course confused you fully i think. we from rc1 started using the same AD footprint, so I would say it's not clear in http://www.farnell.com/datasheets/65433.pdf There's an good example is like this: http://www.midi.org/techspecs/electrispec.php it's a 3-5-2-4-1 but still weird on direction of the arc if comparing to midi.org see also here: http://en.wikipedia.org/wiki/DIN_connector#Analog_audio the KiCad version is correct and good to see if showing its front view. Good catch ! I found one more: right above C34. > Nice catch ! fixed. > > > see here: > > > http://lists.milkymist.org/htdig.cgi/devel-milkymist.org/2010-October/000952.html > > http://en.qi-hardware.com/wiki/Milkymist_One_RC2_Layout_History#20101028 > > Hmm. So we have: > > Pin 1 3 9 15 18 33 > U14 C162 C243 C163+C244 C164 C245 C240+C165 > U15 C159 C251 C158+C252 C157 C156 C248+C161 > > Pin 55 61 > U14 C242 C166 > U15 C250 C160 > > So if C156 corresponds to C245, wouldn't it look more natural > right of C252. I.e., at the position of C245 in the U14 block. > C156 is moved to right of C252. > Let's compare the capacitances: > > Pin 1: C162 = 100 nF, C159 = 10 nF > Pin 3: C243 = C251 = 100 nF > Pin 9: C163+C244 = C158+C252 = 110 nF > Pin 15: C164 = 10 nF, C157 = 100 nF > Pin 18: C245 = 100 nF, C156 = 1 uF > Pin 33: C240+C165 = C248+C161 = 100.01 uF > Pin 55: C242 = C250 = 100 nF > Pin 61: C166 = C160 = 10 nF > > Why the difference on pins 1, 15, and 18 ? I don't see an > explanation for asymmetrical bypassing for U14 and U15 in > the signal integrity analysis. > > By the way, it might would improve the schematics if groups > of bypass caps had comments next to them that indicate the > respective pin. E.g., "(1)" next to C162, and so on. > > Particularly if the caps have different values, it's not > trivial to guess what goes where. Such comments may even > help the layout guys :-) > > added notes to indicate respective pins of U14 and U15. - adam
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