Re: gEDA-user: simulation advice

["Patrick Doyle" <wpdster-atMUNGEDgmail_dot_com>]

> With gnucap you can use "fault", "modify", "param" to
> interactively change component values.  You can also sweep them
> with the "DC" command.  Spice can sweep sources.  Gnucap can
> sweep any single value.
>
> How about .. "R1 (2 4) foo"
>
> param foo=10k
> op
> param foo=47l
That sounds _exactly_ like what I was looking for.  Having played a
little more with Gnucap, I have a few more beginner's questions...

1) How would I model a switch?
2) Did I forget a switch when I built Gnucap that would enable an X
windows plot, or does Gnucap only support ASCII plots?
3) I fetched the spice model for an MMBT3640 from Fairchild, and saw
that my simple circuit loaded up in ngspice, but when I attempt to
load it in Gnucap, I get:

* gnetlist -g spice-sdb -s -o mictest.ckt mictest.sch
.MODEL  MMBT3640  PNP   LEVEL = 1   IS    = 1.41E-15   ISE
                  ^ ? no match

(Note that the "^ ? no match" points to the word PNP in the line above.

Does this mean I need to "attach" to an ngspice model somehow?  If so, how?

Once again, thank you for your patience and your help.

--wpd


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