"The free circuit analysis Spice
program LTSpice, also called SwitcherCad III, is taking the
ham world by storm, and I'm enjoying it myself. Here's a link to
Linear Technology's software page:
LTSpice isn't too difficult to use, and it has a
good Help function. But any sophisticated program presents a bit
of a hurdle. I started out wanting to write down a few commands
and things I'd learned for my own reference. But the paper grew
to include two step-by-step tutorials and a bit of other
information for the absolute beginner, kind of an "LTSpice
For Dummies". If you decide to try LTSpice, you might find
this paper useful. Here are links for a PDF version and the same paper as a Word file. (Updated 10/4/2006) And here are the
LTSpice files for the tutorials, in case you want to compare them
to your attempt.
Transistor Amp and
#2 Lowpass Filter"