Stefan Salewski wrote: > On Tue, 2009-03-31 at 14:46 +0100, [email protected] wrote: > >> Sorry >> I must be getting a bit thick in my old age, are you saying that in the >> second quandrant, ie where the first quadrant is between 0 degrees and >> 90 degs, and the second quadrant is between 90 degs and 180 degs, that y > > Coordinates do not depend direct on quadrant. > > x increases to the right. > > y increases to the bottom. > > 0,0 is top left for pcb boards. > > footprint/elements may have 0/0 at different positions, center or at a > pin. > > Have you seen the verbose > http://www.brorson.com/gEDA/land_patterns_20070818.pdf > and my short description > http://www.ssalewski.de/PcbFootprintRef.txt > > To your capacitor footprints: > > They are rectangular, so its very easy to make them with my sfg script, > I will make it this evening. If you have Ruby installed you may do it > yourself. I was already going to make them, but I have seen a minimal > difference in your dimensions and dimensions on datasheet -- have you > measured it instead of using dimensions from datasheet? I will check > this in more detail this evening, the rest takes only a few minutes. > > I think a working cap is on my page, WIMA. Pitch is right, shape may be > wrong by one mm, this is no big problem. Seems that displaying the shape > graphical does not work correctly at gedasymbols currently. > > Best regards > > Stefan Salewski > > > Thanks Stefan its starting to become clearer now, I'd found the shortened version, and the PCB handbook which I've printed out. Being a RF engineer my brain has got used to working with Cartesian co-ordinates hence the confusion. Its still a bit confusing as the Handbook uses positive co-ordinates and examples in the Brorson docs, and footprints on your site use negative co-ords.
As for the dimensions for the capacitors, I took the lead diameter and pitch from the data sheets I took the physical dimensions off the component, so that would account for any small differences. Many thanks for the help -- Best wishes Richard Bown ##################################################################### Registered Linux User 36561 OS: Ubuntu 8.10, Intrepid, on AMD Dual Athlon 64 +4400: 8 GB RAM DDR2 Ham Call: G8JVM , QRA IO82SP, Interests Microwave #################################################################### _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
