LTSpice is kinda standard. A nice thing about that is you can convert their   
   file to a text file and post it in here, as long as regular test works. Needs   
   nothing, no unicode or any of that shit, just simple text.   
      
   The only problem is there is a lack of a few devices and it isn't quite a   
   piece of cake to make one. for example a potentiometer.   
      
   You CAN make the parts, but then for them to work there has to be a repository   
   or something for them because it has to also be on the recipient's computer.   
   Like a font in a webpage, your browser has to download it.   
      
   But it works well, and you can get away without pots and change it later, it   
   will simulate and all that and you can tell if the smoke is liable to come out   
   or if it is going to oscillate or whatever.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)