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From: Stefan Jahn <stefan@gr...> - 2006-07-25 15:51:55
Am Di, 25.07.2006, 16:40, schrieb mike brinson:
> Hello Stefan
> Thanks for copying to me the information you sent to Antonio.
> I hope that we get some feedback from the OP AMP article.
> This will help me update it in the future.
That was my intention.
BTW: You may probably subscribe to the qucs-devel or qucs-help mailing
> I see that you have added capacitor and inductor initial conditions to
> These will help greatly when circuits fail to converge.
In fact I did even more: I fixed a longstanding bug which I didn't
realize for a long time that is was one. In the transient solver I once
intended to use the DC result as starting conditions. But this somehow
did never really worked. I fixed this. So now you can additionally
choose in the transient analysis property dialog whether to perform an
initial DC analysis. If you select that the result will be used as
initial conditions which are overwritten when setting them excplicitely
for the capacitors or inductors. If you don't choose the initial
analysis you're going to have the results which you got in previous
versions. If this is good or bad - I don't know.
> I have started testing again.
> The good news is that the 555 timer model works.
Sounds even better. :-)
> I have both astable and monostable circuits working.
The transient solver seems to do a good job, since these are the worst
case for that kind of simulation.
> At this stage the model is very basic and needs further work.
> As soon as I have checked it's function I will send you some example
> I am also working on a new set of VHDL tests: these aim to test Michael's
> latest changes and extend our knowledge of the use of FreeHDL. Again I
> send you a test report in the near future.
Yep. Thanks in advance. Let me know if I can assist you with something...