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| 18:58.52 | slapin_nb | hi, all! |
| 18:59.05 | slapin_nb | I'm trying to make differential pair in Kicad http://ossfans.org/difp.png |
| 18:59.14 | slapin_nb | any suggestions? |
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| 19:24.54 | discopig | hi |
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| 23:02.40 | lkcl__ | slapin: use PADS. or even Eagle. simple as that. or write the c++ yourself. |
| 23:02.41 | lkcl__ | https://bugs.launchpad.net/kicad/+bug/593988 |
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| 23:11.57 | slapin | lkcl__: what is PADS? |
| 23:12.43 | lkcl__ | slapin: mentor graphics - PADS 9.3 |
| 23:12.52 | lkcl__ | ok, 9.5 i think's the latest version |
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| 23:14.50 | lkcl__ | i just... i decided quite some time ago after using kicad that i was not going to fuck around waiting for free software to catch up with the professional level that's actually required to reliably develop high-speed PCBs |
| 23:15.06 | buZz | great attitude |
| 23:15.20 | lkcl__ | i can make a ton of money first.... *and then* fund kicad or what the fuck ever |
| 23:15.47 | lkcl__ | buZz: thank you. it's a simple choice. kicad doesn't cut it, therefore don't use it. |
| 23:16.06 | lkcl__ | the alternative is: sit around "learning" for months on end how to manually do e.g. differential pairs |
| 23:16.10 | lkcl__ | by hand |
| 23:16.45 | lkcl__ | when you can in anything *other* than amateur-level PCB routing software set in the Design Rules "these two signals shall be routed together, by a distance of N mil" |
| 23:16.58 | slapin | lkcl__: any pointers on doing differential pairs by hand? |
| 23:17.02 | lkcl__ | and save yourself a fuck of a lot of wasted time and effort. |
| 23:17.12 | lkcl__ | slapin: yes. |
| 23:17.31 | slapin | does have eagle 5.x license and it can't do differential pairs, and I don't want to upgrade :-P |
| 23:17.37 | lkcl__ | a) design and place the components so that you *do not* have to do any layer changes |
| 23:17.47 | lkcl__ | that there are no other components in the way |
| 23:18.06 | lkcl__ | and that you can make the routing as dead-straight as possible |
| 23:18.23 | lkcl__ | like, "line the components up exactly" so they're on the level. |
| 23:19.05 | lkcl__ | the other thing you have to bear in mind is that R.F. frequency level signals don't like going round corners :) |
| 23:19.17 | lkcl__ | that's the reason you don't see right-angles on differential pairs |
| 23:19.27 | lkcl__ | because the signal just... keeps.... going.... :) |
| 23:19.45 | lkcl__ | so, turn corners as infrequently as you can. |
| 23:20.19 | lkcl__ | the only other thing i can think of is: write your own python program to add the 2nd trace to the kicad files (directly) |
| 23:21.10 | lkcl__ | http://code.google.com/p/pyeda/ |
| 23:21.16 | lkcl__ | for example links to kipy |
| 23:21.22 | slapin | lkcl__: If only I found the format description |
| 23:21.42 | slapin | lkcl__: there are things like wcalc.sf.net |
| 23:21.56 | slapin | lkcl__: dunno if I can use these... |
| 23:23.11 | lkcl__ | oh right - you're concerned about the electrical characteristics of the differential pairs? |
| 23:23.19 | lkcl__ | ah that's a bit beyond me :) |
| 23:23.38 | slapin | lkcl__: probably not then |
| 23:24.36 | slapin | lkcl__: anyway, kipy doesn't know about pcb format it seems, so I need to find format documentation to write scripts |
| 23:24.43 | lkcl__ | nnfh. |
| 23:24.51 | lkcl__ | kicad is supposed to have a python interface now |
| 23:25.30 | slapin | well, only if Kicad had trace length tool, that'd be almost enough for tracing differential pairs... |
| 23:25.32 | lkcl__ | http://www.kicad-pcb.org/display/KICAD/KiCad+Scripting+Reference+Manual |
| 23:25.35 | lkcl__ | awesome! |
| 23:25.55 | slapin | lkcl__: testing version; but it diesn't like my multipart .libs |
| 23:26.18 | lkcl__ | http://www.kicad-pcb.org/display/KICAD/BOARD |
| 23:26.21 | lkcl__ | deep joy. |
| 23:26.41 | lkcl__ | ah yes - i had issues with that (on the debian version). |
| 23:26.53 | lkcl__ | i re-ordered the parts and the problem went away. |
| 23:27.08 | lkcl__ | actually what i did was maintain the library parts *BY HAND* |
| 23:27.10 | lkcl__ | using vi |
| 23:27.23 | lkcl__ | is that what you're seeing? |
| 23:27.28 | lkcl__ | that if you edit a part, it fucks up? |
| 23:28.16 | lkcl__ | ok - i gotta go. |
| 23:28.24 | slapin | lkcl__: not only on edit, but yes, slao it fails to select appropriate part; stable works fine (from bzr stable branch) |
| 23:28.34 | slapin | lkcl__: thanks a lot for info |
