devbisme / KiCad-Simulations

KiCad schematics and ngspice simulations originally published by Holger Vogt

Simulation Examples for KiCad 8.0 Using Ngspice

The subfolders contain KiCad 7.99/8.0 projects with schematics containing ngspice simulations, created by Holger Vogt, originally published in a KiCad forum post

⚠️ Directories in this repository are named after the original 7z file name and may differ from the xxx.7z folder name and the contained xxx.kicad_pro project file. This should probably be refactored to follow KiCad best practices of naming the folder the same as the contained .kicad_pro file. This is, however, not a trivial task, as several of the original 7z archives contain multiple .kicad_pro project files.

FOSDEM 2024 presentation

A number of these circuits were included in a presentation on FOSDEM 2024: ngspice circuit simulator - stand-alone and embedded into KiCad (slides)

Ngspice User's Manual

For convenience, here is a link to the Ngspice User's Manual

Simulation Examples

The new simulator interface in KiCad 8.0 is offering a lot of enhancements, which make it absolutely worthwile to have a look at this development.

The previous examples (KiCad 6, ngspice-38) are published in this KiCad forum post, some of which have been updated and included below.

The examples provided should run out-of-the-box: locate the project subfolder, open the *.kicad_pro project (or directly open the *.kicad_sch file), in KiCad Schema Editor ➡️ Inspect ➡️ Simulator ➡️ Run (green triangle).

Circuits

The circuits shown below are not optimized, but may serve as a good starting point.

• Boost Converter, see Boost
• Regulated boost converter, see boost-complete
• Regulated boost converter, see boost-regulated-os
  Version which does not need ngspice-42, as it relies on a pwm generator made with the vernerable one-shot code model.
• Buck Converter, see Buck
• Royer Converter, see Royer
• LLC Converter, see LLC
• Digital PWM amplifier, see pwm-audio
• Digital PWM amplifier update, see pwm-audio-2
• Another Class-D 2.5 kW audio amplifier, see Class-D
• Analog multiplier, see analog-multiplier
• Generic symbols with generic models, see intro4
• IBIS interface simulation, see ibis-test
• Amplifier with controlled gain, see gain-ctrl-amp
• Up-Down Counter, see up-down-counter
• Triangle generator with MAX9000, see MAX9000
• The venerable ICL8038, see ICL8038
• Generating a negative voltage from a positive supply with LTC1044, see LTC1044

More circuits from previous posts, tested/updated for KiCad 7.99/8.0

• Integrated linear amp (LM3886), simple, real, Tian Probe, see LM3886-Tian
• A bipolar 741 operational amplifier, see 741
• Q17, a redesign of the famous QUAD405 High-End Audio Amplifier, see Q17
• Digital Simulation, see QEI_public_799
• rel_osc (missing documentation), see rel_osc
• A simple Phase Shift Oscillator (no documentation), see bip-osc-2
• CMOS555_4 (missing documentation), see CMOS555_4
• FullBridge (missing documentation), see FullBridge