Hi Alexandre, I do not have a recommendation for you, I learned spice while patching the Berkeley 3f5 source to compile cleanly under Linux and to stop it from crashing the editor ... also xcircuit to run a script that runs spice when saving a spice netlist ... Anyway there are two basic spice books, one of them is called the spice book (how surprising). Look on Amazon etc. I cannot recommend them because I haven't read any of them ;-(. Maybe someone else on the list. I've been playing with SwitchCad III and I like it but the animations and the frequent screen redraws are a little unnerving for someone used to a sober spice batch run under X11. Anyway as you said, it works great and the price is great. I think that this program will make a significant contribution to hobbyists everywhere (at the very least). I will try it soon under wine (windows emulator under linux). I hate to reboot for anything other than playing games or installing hardware ;-). Peter -- Quoted Context --: Hi, Peter > Open the tools->SPICE and set the max timestep to at most 1/20 of the > expected osc. period. F.ex. for 100kHz max expected osc. freq. set 5e-7 > > This is true for any .tran analysis in any spice program I know of. Thanks, that did it. I am much better with digital stuff and have almost no experience with spice simulations but maybe SwitchCad will change that. It is a pleasure to use and the price is right. Do you have any recomendations for books about spice simulators ? -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.