Peter Clifton wrote: > On Sat, 2007-09-22 at 20:35 +0200, Stefan Salewski wrote: >> I think that opamp-1.sym will not be compatible with SOT23-5 footprints >> -- in TI datasheet of OPA656 pin 1 is output for SOT23 package. Maybe >> opamp-1.sym is compatible with SC70-5 configuration, which I have newer >> seen. >> >> Or opamp-1.sym and opamp-2.sym are only abstract representations of an >> OpAmp, without any relationship to a concrete footprint? >> >> In any case, there seems to be no symbol in gEDA related to an ordinary >> OpAmp in DIP8 (or SO8) package. >> >> This may look very strange for new gEDA/pcb users. > > There are various "heavy" symbols, such as lm741-1.sym. > > It is a well known problem though, the mapping between a light symbol > and a real package is not something which is easily solved. >
which is why I'm in favor of a heavy symbol generator for op-amps like the one I demonstrated for bipolar transistors. You use a small set of symbols and then have a text file which is essentially a spread sheet that for each actual part number (the full vendor part number including package code) you give the mapping from symbol pin to the footprint pin # as well as list the actual footprint. Its pretty simple, you don't have to continually wonder if you have the right footprint or right pinout, and you only have to maintain a small number of graphical symbols. Adding new part number is then a snap. I'm more and more convinced it is the way to go. -Dan _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
