Qucs-S Files

New features

• Implemented advanced RF circuit synthesis tool by @andersmmerra [#1434] Old filter design tools are candidates for deprecation in the next version.
• RxCalc utility implementing multi-stage receiver calculation by @arhiv6 is integrated with Qucs-S [#1463]
• Added possibility to select BJT, JFET, MOSFET, and Diode from library using a button in device properties dialog [#1478]
• Added shortcut manager [#1528]
• Update Application settings->location UI [#1613]
• Added SPDT switches and relay [#1602]
• Added system command component [#1606]

Library update

• Added Darlington BJT library [#1546]
• Added SPICE models for USSR opamps [#1586]

General improvements and bugfixes

• Show line numbers in text editor [#1520]
• Fixed bug with SPICE netlist generation for multiple Qucs equation blocks [#1557]
• Fixed environment variables expansion for Xyce [#1610]
• Fixed SPICE AM sources [#1587]
• Fixed SPICE netlist generation if schematic contains dangling nets [#1594]
• Improved graph performance when rendering huge points number [#1598] [#1600]
• Added DIN A6 schematic frame [#1554]
• Refactoring and bugfixes in schematic editor by @tskaar [#1514] [#1523] [#1559] [#1560]
• Improved rotation in schematic editor [#1488]

Localization

• Updated Russian and Italian translation [#1464] and [#1490]

What's Changed

• Update NGspice URL by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1462
• Russian translation by @antohami in https://github.com/ra3xdh/qucs_s/pull/1464
• fix(WireLabel::mirrorX/Y): Handle axis input by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1473
• Fix Monte Carlo ngspice template by @ivandi69 in https://github.com/ra3xdh/qucs_s/pull/1486
• fix(WireLabel): Handle transformations for detached WireLabels by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1487
• [WIP] New RF tools by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1434
• feat(Schematic): Add transformations to paste selection by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1488
• Add RxCalc submodule by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1471
• RF Design Tools: New features and some class refactor by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1501
• refactor(MouseActions): extract mouse movement logic and fix tracking bug by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1506
• Add a plus sign on voltage controlled sources to indicate polarity by @mc2285 in https://github.com/ra3xdh/qucs_s/pull/1508
• Fix Issue [#1510]: Bug with microstrip filter synthesis by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1511
• Refactor(Schematic): node disconnection and element decoupling logic with doHeal control by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1514
• Update new file icons by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1521
• Text Editor: Add line numbers widget by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1520
• S-parameter Viewer: Export feature by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1519
• Fix crash when pasting zero-length wires in Schematic::installWire() by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1529
• Fix issue [#1518]: Open sym files in Qucs-S by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1530
• refactor(Schematic): move node transformation logic to owner by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1523
• feat(MouseActions): add keyboard driven move and move-and-stretch commands by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1524
• fix(MouseActions): wire stretching by dragging node by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1535
• add port name to spice symbol mapping table by @soldermate in https://github.com/ra3xdh/qucs_s/pull/1531
• Bump fonttools from 4.55.3 to 4.61.0 in /qucs/python by @dependabot[bot] in https://github.com/ra3xdh/qucs_s/pull/1532
• Small fixes by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1538
• Shortcut manager by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1528
• Update QT version and macOS intel fixed by @dsm in https://github.com/ra3xdh/qucs_s/pull/1544
• S-par Viewer: Direct coupled filters improvement by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1540
• Add Darlington BJT library by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1546
• fix missing symbol in NMOSFETs.lib by @Radvall in https://github.com/ra3xdh/qucs_s/pull/1547
• Fix issue [#1551]: Duplicate and Rename actions disabled in Project view by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1552
• fix(convertToQucsData): guard against out-of-bounds for extra_vars_dims by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1550
• add rxcalc to macos app bundle by @dsm in https://github.com/ra3xdh/qucs_s/pull/1553
• Add DIN A6 schematic frame by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1554
• Diagram Dialog: Improvements and fixes by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1555
• Fixed SPICE netlist for multiple QucsEqn blocks by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1557
• fix windeployqt exe naming by @dsm in https://github.com/ra3xdh/qucs_s/pull/1565
• fix(mouseactions): properly deactivate action when releasing keyboard move by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1559
• S-Parameter Viewer documentation (and some fixes) by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1567
• (fix:qucs-s-spar-viewer) Refactor convert_MA_RI_to_dB to use references, be case-insensitive by @sjgallagher2 in https://github.com/ra3xdh/qucs_s/pull/1571
• fix(ngspice/noise): data duplication in PerPtsSummary by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1560
• Select model from library by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1573
• S-Parameter Viewer: Fixes by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1575
• Migrate S-Parameter Viewer tool to submodule by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1577
• Bump pillow from 11.1.0 to 12.1.1 in /qucs/python by @dependabot[bot] in https://github.com/ra3xdh/qucs_s/pull/1581
• Update qucs-s-spar-viewer submodule by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1584
• Small fixes and library update by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1586
• Fix SPICE AM sources by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1587
• feat(createNetlist): filter out dangling nets by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1594
• Fix GUI freeze when rendering huge simulation dataset by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1595
• Don't reload graph data on every interaction by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1600
• SPDT switches by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1602
• fix(AbstractSpiceKernel/getActiveLabelledNets): iteratively traverse wire nodes by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1604
• Fixed equation parse in equation editor by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1608
• System Command Component by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1606
• feat(Xyce): expand environment variables when using 'include', 'lib' and 'include script' by @tskaar in https://github.com/ra3xdh/qucs_s/pull/1610
• Update QT version and re-enable ARM build for Windows by @dsm in https://github.com/ra3xdh/qucs_s/pull/1614
• Update on the "Application Settings->Location" menu UI by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1613
• Fix issue [#1616] - AC Power Source with ngspice and Xyce by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1617
• Update qucs-s-spar-viewer submodule to v2026.04.07 by @andresmmera in https://github.com/ra3xdh/qucs_s/pull/1620
• Prepare for v26.1.0 release by @ra3xdh in https://github.com/ra3xdh/qucs_s/pull/1618

New Contributors

• @mc2285 made their first contribution in https://github.com/ra3xdh/qucs_s/pull/1508
• @soldermate made their first contribution in https://github.com/ra3xdh/qucs_s/pull/1531
• @dependabot[bot] made their first contribution in https://github.com/ra3xdh/qucs_s/pull/1532
• @sjgallagher2 made their first contribution in https://github.com/ra3xdh/qucs_s/pull/1571

Full Changelog: https://github.com/ra3xdh/qucs_s/compare/25.2.0...26.1.0