Op donderdag 08-11-2007 om 11:43 uur [tijdzone +0000], schreef Peter Baxendale: > Richard, I don't see a "file" attribute anywhere in your schematic to say > where your spice model is. You can add a file attribute to each opamp > symbol or add a spice directive symbol with the file attribute set > to your spice model file. You should see the opamp subcircuit model > included in the spice netlist. > Also make sure the pinseq attributes of each pin in your opamp symbol > match the order of the parameters to your spice model. In my > experience the gschem opamp symbols usually need changing.
Ah, yes, that did the trick ... I did put both .sym files where gschem could find them, in gEDA's spice symbol subdirectory (otherwise I couldn't have selected the opamp in gschem in the first place) and assumed that this would be enough. Which isn't the case, obviously. And, of course, this *is* mentioned in the manual (albeit in a more general manner). But I think I'll compile all the good advice I got here into a sort manual of my own, together with several step-by-step examples, and also the mistakes I made and the points I had trouble with -- I'm pretty certain that in a few months, I'll have forgotten one or more essential steps. For me, the best way to learn new things is by means of clear and detailed examples, with a manual to explain what exactly is happening and why. Just a manual simply isn't enough for me, especially when there are so many things that I can do wrong. And perhaps if this manual of mine seems useful, I could post it online, and/or offer it as an addition to the rest of the gEDA documentation. > Also make sure the pinseq attributes of each pin in your opamp symbol > match the order of the parameters to your spice model. In my > experience the gschem opamp symbols usually need changing. I literally copied Stuart Brorson's .sym files he posted on the mailing list, and already double-checked the pinseq attributes; these were fine. Anyway, I finally succeeded in simulating several filter configurations, and these simulations indeed closely match the real-world results I got from the circuits on my workbench :-) Thanks again for the help, and I think I can manage on my own from here. Best regards, Richard Rasker _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user