osc.sch This design is a mixed analog/digital oscillator circuit which demonstrates the mixed A/D capabilities of MicriSim PSpice. The circuit can be run on MicroSim PSpice A/D, MicroSim Basics+, and the MicroSim Evaluation (student) versions. Required Symbol libraries: Port.slb 7400.slb (or eval.slb for the evaluation version) Analog.slb Required model libraries: 7400.lib (or eval.lib if using the evaluation version) Other required files: osc.stim - stimulus file. Markers have been place on all nodes of interest so that their traces will automatically be displayed when Probe is started.