FREE ELECTRONIC CIRCUIT DESIGN AND SIMULATION SOFTWARE,

POWER SUPPLY CALCULATORS, CAD PROGRAMS DOWNLOADS, PSPICE MODELING,
AND OTHER ENGINEERING DESIGN TOOLS

Circuit simulation

is a technique of predicting the behavior of a real circuit by a computer program. It replaces real components with idealized electrical models. Since the result can never take into account all physical processes in the parts and all PCB parasitics, it will only reflect the model that is put into it. Therefore the simulators can't substitute breadboarding and prototyping. Most general-purpose program are based on various versions of SPICE (Simulation Program with Integrated Circuits Emphasis) and can handle analog, logic and mixed-signal components. Commercial software usually include schematic capture, extensive model libraries, and waveform display and analysis functions.

Electrical design and analysis programs are relatively expensive. Designers who want to simulate their circuits without buying a full package have basically three options: 1) Working demos (usually limited to small-size circuits with some functions disabled); 2) Open source programs (with little or no tech support); 3) Software provided by ICs manufacturers (normally good only for the designs that use these manufacturers' parts).

Here you will find links to free electronic circuit simulation software, power supply calculators, and other electrical engineering design tools on the web.

FREE ELECTRICAL CIRCUIT DESIGN SOFTWARE and EDA (DEMOs and GPL)

VENDORS' POWER SUPPLY DESIGN AND CIRCUIT SIMULATION SOFTWARE

POWER SUPPLY CALCULATORS AND SPREADSHEETs

General-purpose circuit simulation program download for Windows (MinGW) and Linux based on Spice 3f5

PowerESim -free online power electronic circuit simmulator and design tool (waveforms, loop, thermal, harmonics)

Non-Linear Electronic Circuit Simulation- uses ideal components for fast analysis

Analog simulation and design tool (limited size student version)

Online SPICE simulator resources- free PSPICE models, tutorials, downloads

gEDA - GPL'd suite of Electronic Design Automation (EDA) tools for GNU/Linux platform

PSIM - working demo for power circuits <

Caspoc freeware - power electronics simulator

LT Spice / Switcher Cad III download- electrical circuit simulation for switching regulator ICs

Webench - online electrical design, calculation and thermal analysis

TINA-TI™ - analog circuit analysis

Waveforms and losses analysis of multi-phase DC-DC converters

FIND ENGINEERING SOFTWARE BY SPEC

ELECTRICAL FORMULAS, THEOREMS, LAWS and DESIGN BASICS

Analysis of critical conduction mode active PFC boost regulators

Power factor correction (PFC) boost design

Buck regulator calculation spreadsheet

Simulation tool for offline flyback converters in discontinuous current mode

Basic online calculation and waveforms of currents and voltages for main SMPS converters

PRIVACY