I have a pretty complicated schematic in LTSpice (at least it is the most complicated schematic I ever tried to simulate in LTSpice).
For some reason simulation of just 20 ms turns into about 15 seconds to accomplish.
I have several theories:
- The schematic is complicated, computer is slow (it is really not very powerful) so I can not expect anything faster.
- I have some trouble in the schematic cosing LTSpice to short the iterations and therefore – slowdown the simulation process.
If I'd skip the first, how can I trace down the problem part of the schematic?
- cut some suspicious parts of the schematic to define if the simulation became reasonably fast (did not help – simulation time vary from something 10 to 20 seconds)
- put initial conditions to "charge" capacitors to intended voltages (it helped as I could make the simulation time shorter: 20 ms instead of 100-200 ms)
I put 10 MOhms resistors between optos and ground
Is there any method to find a problem node?
I think that I will not ask the community to find the problem for me as I'd better learn to do it myself. So this is why I did not put my schematic in the question.