Decent electrical circuit simulations

[Aina]

Hi,

I am trying to analyze circuits with a capacitor, diodes (normal and zener) and load resistance. Was wondering if anyone knows of good simulations on the web. Had a search but didn't find anything decent except this www.alternate-energy.net but it doesn't have zener diodes... In the lab we can't use circuits overtime and I have no equipment at home so need to improvise.

Thanks.

 

[f95toli]

LTSpice is a good and free SPICE implementation with a reasonably good user interface.
Free download from www.linear.com