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The model for LM311 used in PSpice and several other simulation programs do not function according to the Data sheet from National Operational Amplifiers
Databook. Does anyone know were I can find a working model?
I received the spice model you PM'd me. It looks ok, but uses some directives that are no longer used in spice3 (which might be why your model did not work correctly). In any case, I tried a model that I had in a hysterisis configuration, presumably for a tachometer circuit since that seems to be asked about 1/week on this board. Here is the model (sorry if the tabs do not line up).