SIMU 1239. W11. WEIRD LATCHING WITH BIPOLAR TRANSISTORS

Copy the sim1 in a new folder and try the three circuits. It is another case of inestability... It usually fails in w11.

R1255 does the same in this particular case. tell me please.

R1255 does the same in this particular case. tell me please.

For me it does the same only in the PNP case (middle one).
Can you confirm it?

This one also happens in Linux.

No... looks like it is random, middle and right circuit fail randomly.

Yes, When the fail is not constant it is very difficult to explain it, so I am glad it happens to you too (Con perdón).

I think I definetly solved the problem with differences betwen Linux and Windows builds.
The previous solution was not good or even complete, what it did was making the Linux simulation worse.

Now all these circuits work ok in both versions... if and only if there is only one in the scheme.
So there is another problem here, but at least the simulation should be same in all OS.

EDIT:
No way... these transistors are laughting on me.

In any case I don't like those bases floating...

The 1 case is an open base and it works always.




Look, to the original schematic, adding a simple open switch, it seems that the third case works always, witches?



Simply removing the GND and wiring all,  it starts to work... but the probes need a ground.

The 1 case is an open base and it works always.
...
Look, to the original schematic, adding a simple open switch, it seems that the third case works always, witches?

You can see it like this: when the base is "floating" it is not guaranteed to work but it could work in some cases.
Any of those circuits work in some cases.
Any simulation has it limits, and this is right in the limits of this simulator.

Simply removing the GND and wiring all, it starts to work... but the probes need a ground.

Indeed, probes are referenced to ground.
You can add a ground to the circuit.