[sdiy] LTSpice problem

[David G. Dixon]

> How long was your simulation run ? It ~is~ real life in the short term if
> you
> assume the capacitor started at 0V.
> 
> I'm not an LT Spice guru, but I think you can specify when it starts
> taking
> data to graph. Wait an appropriate time, then start graphing. With 10uF
> and
> 100K, I'd expect it to take about 5 seconds to get centered around zero
> volts
> 
> (100K * 10uF) * 5   (5RC)

In MultiSim, I typically reduce the size of RC caps by a factor of 100 or so
in order to compress the time of the output, as it takes many minutes to run
a simulation for even a couple of seconds of simulated time, particularly if
the circuit is at all complex.  This is especially useful for simulating
envelope generators, lag circuits, etc.