Am Mi, 31.05.2006, 15:09, schrieb Markus Weissbacher:
> I dont want to annoy you, I just haven't fount that error neither in the
> faq nor in the mailing list, it might be, that I have just done someting
> wrong in the program.
you don't annoy me at all. Thanks for the report.
> This is an astable multivibrator, the problem is, that when I change R2
> from 1k to 100Ohm the simulation runs, but has several warnings, which I
> dont understand. If R2 stays 1k it doesn't even simulates.
> I have also discovered a similar error in pspice, it doesn't work eighter.
> I have built this network in reality and there it does a rectangle signal
> with about 3.3kHz.
I think you expect a 3.3Hz (not 3.3kHz) don't you? Otherwise I don't
understand why you wait for 1000ms...
Bistable circuits are always a problem in transient simulation. First
you should replace the ideal diodes/transistor with real models of the
devices you in fact used. Probably you find a SPICE model for these? Or
do you know all the parameters of them? Then you can fill these values
into the properties of the models in Qucs.
I played around with your circuit and put in some models from the
library manager. Then I was able to get a 3.3Hz signal...