Spice is an industry-standard analog simulator originally developed here at U.C. Berkeley. Spice by itself is extremely awkward to use. We use the spice implementation by MicroSim, which includes schematic input and graphical output. MicroSim distributes a free evaluation version of Spice called PSpice, which runs on PCs. You can download a copy directly from MicroSim. PSpice is a very big program (approx 12MB) and will take some time to download over a modem. We also have CDs of the software available for overnight loan.
The free evaluation version of PSpice comes with a modest number of part models. Many of the circuits available here require additional part models. Follow the downloading and setup instructions here to load the additional parts.
The circuit models available here are organized by circuit type. All of the circuits require you to download the circuit schematic before simulating; some also require you to download a graphing file as well. Both files must be loaded into the same directory; and the directory must obey MS DOS (8+3) naming conventions. Follow the instructions in Lab 3 for more information.
If PSpice produces errors when run on a particular schematic, try repackaging the circuit: pull down the Tools menu, then press Package.
All the Spice circuits can be downloaded together with this zip file.