Thanks for your great work on QUCS. With regard to the sawtooth
voltage source, it appears that there is a bug that makes the
rectangular voltage source unusable for triangular waves (on QUCS
0.13). You can look at the attached schematic and the data file, to
see that setting the rise/fall time much larger than the peak time
yields an incorrect input waveform. The precise shape of the waveform
is highly dependent on the number of transient simulation points,
which is obviously incorrect.
On Thu, Mar 20, 2008 at 3:33 PM, Stefan Jahn <stefan@...> wrote:
> Am Do, 20.03.2008, 06:44, schrieb Brian M. Sutin:
> Hi Brian,
> Thank you for your report.
> > Next I was repeatedly confused by what I think is a bad standard for
> > component placement GUI's. After I select a component and drop it into
> > the schematic, I almost certainly do not want to drop another. Yet the
> > GUI stays in the component-drop mode. Better would be to switch to the
> > component select-and-move mode automatically after dropping a component.
> > I have seen other programs with the same behaviour, and it always throws
> > me off.
> When using real drag-and-drop (select component, keep pressed, move
> to schematic, then drop by releasing mouse) then you get the behaviour
> you probably wanted. When selecting component, releasing mouse, move
> to schematic, then you can place several components of same type. When
> pressing right mouse you can rotate the component and placing it...
> > I could not find some basic components. I wanted an ideal diode. I also
> > wanted a voltage source with a sawtooth (or triangle) wave.
> What exactly you consider an "ideal diode"?
> For sawtough wave voltage source use the puls-source and adjust the
> timings (period+rise/fall times).
> > Next, the units for frequency appear to be GHz only. I am trying to model
> > a power supply type of circuit operating at 20 kHz. The units were
> > awkward. Just typing in 'kHz' didn't work. Being able to set the units
> > for the schematic would be nice.
> You can do this actually. Sure you used kHz? Case sensetive!!
> > Last, when I tried 'simulation', I got the error:
> > checker error, no actions defined: nothing to do
> > The problem with this error message is that it does not tell me what is
> > wrong, or what I can do to fix the problem. The error message needs
> > improvement. My circuit has labeled wire-endpoints, so the message and
> > the help documentation give me no idea how to proceed.
> You need to place a simulation box on the schematic.
> Cheers, Stefan.
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