One thing I'd be wary of when using the Falstad simulator (and possibly others) is that the timestep setting can have a dramatic effect.
The default timestep is 5us, and often you will see magnificent results at that setting, but if you reduce it to 100ns or lower then the effects are gone. I prefer to use a timestep of 1ns to mitigate this to a certain extent. Lowering the timestep makes it harder to determine what is happening in human perceptible time intervals (seconds) because it takes a lot longer to run the simulation, but you do gain much more resolution for shorter time periods.
Reality doesn't have a resolution limitation, aside from the Planck length as far as I know. Instruments & probes do, but nevertheless it's best to experiment if at all possible. Don't place too much faith in simulations.
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