Kai-Martin Knaak <k...@familieknaak.de> wrote: > A bill of material (BOM) woud help to estimate the necessary effort. The > BOM should include the package of the parts, especially of the connectors > and special ICs.
http://ifctfvax.Harhan.ORG/OpenSDSL/OSDCU/OSDCU-AA.bom http://ifctfvax.Harhan.ORG/OpenSDSL/OSDCU/shortbom.txt > So it can be seen whether or not all footprints are > available in the existing pcb libs. I have already drawn all the necessary footprints in the PCB format. I have provide them either in the form of a file-per-element tarball (each file inside named after the refdes) or in the form of a .pcb file like you would get from an initial gsch2pcb run. > Maximum PCB size matters. An otherwise unspectacular layout task can get > really nasty if the maximum allowed size is below a certain threshold. > Again, a BOM would help to estimate. Because it's a totally non-commercial hobby project, terms like "maximum allowed" are not applicable. The size I have specified (130x165 mm) is only a suggestion - I had come up with it by measuring the size of an existing DSL modem board whose circuit complexity appears similar to mine. But again, it's only a suggestion - if a different (larger) PCB size would result in a significantly lower layout labor bill, go for it! > If cost is a factor, why not aim for four layers but slightly larger size? The only cost that is a factor is the layout labor cost, and I thought that having more layers makes the layour labor easier. The cost of physically making the PCB is not a factor - I have checked pcbexpress.com and their price for a 6-layer board of the size I have in mind is perfectly affordable, which is all that matters. Again because the project is non-commercial, mass production is not a consideration. MS _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user