fca

Sure, moreover I am far from being an expert, and my ignorance compounds with the problems of the tool. Thanks for you help. Did you look at my other problem too? Thanks again and best regards,

Thanks for your answer. I hope you can find a volunteer for the job. Best,

Results are logical, but the system seems a bit fragile per se. Do you think there can be a chance of someone looking into this and debugging? I like a lot this application, but it is a long fight to get the system working (see also my other problem). I like very much qucs, UI and the rest, but I think that failing to simulate "out-of-the-box" such simple systems prevents its use in a more complicated circuit. Best,

Pinging support. Has anybody had time to look at my problem? Thanks and best regards,

Pinging support. Has anyone had time to look at my problem? Thanks and best regards.

Here is a simulation of the same with iCircuit, and it behaves as it should. : Animation with iCircuit Regards

I have worked with this circuit and I am convinced that there is a problem with qucs. The only way I could have it working is to have the switch to change state at 2 and 4 secs. Any other value freezes the program. I am attaching the plot at 2s;4s; which looks reasonable. Any other combination fails. Any help would be appreciated http://cern.ch/fca/Fade.sch Thanks!

I have worked with this circuit and I am convinced that there is a problem with qucs. The only way I could have it working is to have the switch to change state at 2 and 4 secs. Any other value freeze the program. I am attaching the plot at 2s;4s; which looks reasonable. Any other combination fails. Any help would be appreciated http://cern.ch/fca/Fade.sch Thanks!