Looking to simulate a circuit design before you build it? LTSpice is a powerful program used for simulation and analysis of circuits. These are step by step instructions on the basic building blocks of LTSpice leading up to advanced techniques such as initial conditions and AC analysis.
Difficulty: Easy-Slightly Challenging
A computer running Windows, and a recent version of LTSpice, which can be downloaded for free here:
Most information can be found in this free online PDF:
Or try these forums: