#216 The circuit is being simulated as expected only if I add resistor 0.001 Ohm to the switch and this does not make sense

[Valentin Stoykov]

The circuit does not work as expected when the switch is connected directly, but works when the switch is connected with a 0.001 Ohm resistor in series.

I consider this a bug, because it does not make sense.

[Valentin Stoykov]

Also, it's strange that the base voltage is increasing when the button is turned on. This does not make sense, because the opposite should happen.

The log is:

Output:
-------

Starting new simulation on Tue 25. Dec 2018 at 20:06:55:082

creating netlist... done.
project location: 
modules to load: 0
factorycreate.size() is 0
factorycreate has registered:
parsing netlist...
checking netlist...
netlist content
      4 Diode instances
      2 Switch instances
      1 C instances
      2 BJT instances
      3 VProbe instances
      6 R instances
      1 Vac instances
      1 TR instances
creating netlist...
NOTIFY: TR1: average time-step 4.39303e-05, 966 rejections
NOTIFY: TR1: average NR-iterations 2.94084, 72 non-convergences

Simulation ended on Tue 25. Dec 2018 at 20:06:58:163
Ready.




Errors:
-------

WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08
WARNING: Increased breakdown current to 0.00243695 to match the saturation current 6.3e-08

[Valentin Stoykov]

I noticed that the circuit is stop working correctly when I change the R6 from 0.001 to 0.0001 (it's working like in the case when R6 is shorted).

[Valentin Stoykov]

The bug can't be reproduced on Qucs 0.0.19 for Windows.