al davis wrote: > Ah .. there's a good idea .. "don't have to be exact" .. they > never are .... Not detailed, but just good enough for a > beginner. ...... Now we need a volunteer to do it. > > Have things like a generic parameterizable op-amp. .. with > parameters like gain, gbp, and so on.
Parameterized models are already for the user who got beyond the first successful projects. For the first steps, there should be as little room to screw up as possible. While parametrized models are great and should be provided in the default install, there should be a set of ready-to-use generic models too. For the getting started stage, it is these ready-to-use models that matter. > Can you make a list of the ones that should be included? Ok, this is what I'd regard as essential to get started with simulation. I chose components that represent common, cheap components in the real world: 1) ideal passives with their nominal value as parameter: resistor inductor capacitor IIRC, these are already readily available in a default install of gnucap. 2) diodes: Any generic diode would do. If in doubt, the parameters of 1N4007 should do. 3) bipolar transistors: Any of the kind that is commonly referred to as universal silicon "TUN", or "TUP". Say, BC847 / BC857 4) Signal FETs: Again, any of the generic silicon models would do. E.g BSS123 / BSS80 5) Power FET: Some common NFET that comes in TO220 package, e.g. IRF720 6) Opamps: a) An ideal opamp with essentially infinite amplification, infinite slew rate, zero bias current, no input offset, etc. b) A more realistic model of a common opamp, with bipolar input, e.g. OP07 c) A more realistic model of a common opamp with FET input, e.g. TL081 d) A more realistic model of a common fast opamp, e.g. LM833 7) Comparators. Like with the opamps, an idealized model should be complemented with a common real world component. E.g. LM393 8) Signal source with the capabilities of a simple frequency generator (sine, square, triangle, pulses, sweep) This set of components would already allow for lots of non trivial simulation. Other integrated components like analog switches, voltage constants, transformers, or mixers would be nice to have. But they are not essential to get started. > The vast majority of gnucap users are not geda users. This might change, if geda provides a way from schematic to simulation that is as straight forward as the way from gschem to pcb. ---<)kaimartin(>--- -- Kai-Martin Knaak Öffentlicher PGP-Schlüssel: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x6C0B9F53 _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user