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Qucs-S is a free, open-source circuit simulation application that combines graphical schematic design with SPICE-based analysis tools. Based on the original Quite Universal Circuit Simulator, it provides an intuitive environment for building and evaluating electronic circuits. The software supports multiple simulation engines, including Ngspice, Xyce, SpiceOpus, and Qucsator. Users can construct circuit diagrams using passive components, semiconductor devices, and imported component models. It supports DC, AC, transient, and other simulation analyses depending on the selected engine. Results can be examined through graphical plots and measurement tools. Available for Windows, macOS, Linux, and FreeBSD, Qucs-S helps engineers, electronics enthusiasts, researchers, and students design circuits, investigate their behavior, and evaluate performance before physical implementation.
Features
- Graphical electronic circuit schematic editor with passive, active, and semiconductor components
- Multiple simulation engine compatibility with Ngspice, Xyce, SpiceOpus, and Qucsator
- DC operating point, AC frequency, transient, and additional SPICE simulation analyses
- Interactive waveform plotting and data visualization for examining circuit simulation results
- SPICE model integration and component libraries for realistic electronic device simulations
- Integrated circuit design utilities for filters, attenuators, transmission lines, and RF applications
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