Re: [Qucs/gnucsator] Assertion failed (#9)

[Felix Salfelder]

On Fri, Sep 17, 2021 at 04:24:43PM -0700, Dow Drake wrote:
> The only issue was with the output voltage during the pulse fall
> period -- it should reach zero before the input pulse does because of
> the base-emitter drop.

If I understand correctly... the simulation does not show that the
output voltage does not reach zero before .0012s. The plot is a bit
misleading here, look at the data points (few).

The Gnucsator transient command wrapper ignores most arguments, and runs
with automatic time steps. There was no need to change this yet.  Some
simulator options are global, and can be set in the .rc file or at the
top of the input file, by hand. ".options trtol=1" etc. But fixed time
stepping is an argument to the transient command.

If you are interested in the timing of the signal approaching zero, you
could add a component that depends on it. In Qucs, that would be
something like

Relais:XX gnd gnd gnd out Vt="0"

Which is actually just a voltage controlled switch. Time step control
should kick in, as soon as the voltage approaches the threshold.