On the other hand maybe they just have a billion GPU cores crunching the numbers in the background. My actual motivation for switching from CL to Qucs was that I expected much faster simulations from locally running, compiled code rather than serverside sims. CL just bombs over steep flanks and still manages to stay correct in non-flank regions. But other tools - like CircuitLab - seem to somehow trick their way out of that issue. I see the problem with maintaining stability while integrating the ODEs, so on stiff rises it needs to do very small timesteps. Unfortunately so slow rise/fall times aren't that good for modeling reality, where three or four orders of magnitude faster times are achieved with run-of-the-mill ICs. I had to increase the rise/fall time of the rect generator to 10µs to make it work, and even then I notice the progress bar stands still a few times for a very long time, presumably at the points where it's integrating the rect-steps with smaller dt. Qucs intentionally uses its own SPICE incompatible simulation kernel Qucsator. It merges the power of SPICE and the simplicity of the Qucs GUI. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI. I've tried with various timesteps, to no avail. Qucs-S was forked from the Qucs cross-platform circuit simulator in 2017. PS: I did see the "RLC pausing" thread right below, but couldn't quite translate the solution there to this situation. The output in the window is unspectacular: If you remove the inductor at the top, everything seems to work fine. Keeps one core at 100% forever without any progress (The graphs showing at the bottom is a leftover from a different circuit). Qucs A Tutorial Qucs Tutorial: Simulating a common emitter bjt amplifier. In very simple circuits, the transient simulation seems to hang indefinitely. I'm really enjoying Qucs but I've noticed a strange phenomenon.
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