sim logo
This section will focus on some popular circuit simulators both and will include some tutorials.

Until computers were available, circuit analysis was done by hand with pencil and paper, calculations were long and often prone to error. With a computer, results are available in seconds and printouts can be produced. Also, measurements which would be difficult or impossible to do on a real circuit can be made on a simulator. Many programs allow schematic capture and some even allow creation of a PCB layout. You still have to design the circuit yourself, and results will only be as good as your initial circuit input.

Most Simulation programs are based on the original 1970's SPICE program and some have additional features. The original Spice2 program was wrote in fortran and contained models for transistors, FET's, diodes, resistors and capacitors and could perform AC and DC analysis, transient and time domain analysis. The later Spice3 version included models for MOSFET and added noise, distortion and pole-zero analysis, temperature sweeping, monte carlo and fourier analysis.

Though not a simulator itself, Kicad is a very capable PCB drafting program and will also be featured in this section. Click the logos for the appropriate simulator page.

Click the logos for the appropriate simulator page.

tina logo
"TINA" stands for (Toolkit for Interactive Network Analysis) and is made by from designsoft. It has schematic capture and can perform many analog and digital analyses.

ltspice logo
LT Spice IV is a free spice 3 based simulator from Linear Technology. Originally called Switchercad this simulator was used in analyzing switched mode power supplies, but has the ability to work with transistors, FET's and IC's and has become an invaluable tool for circuit simulation and schematic drafting. To get a copy, visit this page on Linear Technologies web site. The program can be run under both windows and linux.

circuit maker logo
Sadly Circuit Maker is no longer available but has now become Altium Designer. Circuit Maker was the first program I ever bought and there's still a large following and I hope you find something useful in this section.

kicad logo
Kicad though not a simulator in itself, is an open source schematic capture and PCB drafting program. Designed and written by Jean-Pierre Charras, it runs on both windows and linux and features auto and manual, routing, output in gerber format and can generate beautiful rendered 3D graphics view of your PCB.

Other SPICE Programs
The title (link) gives examples of Circuit simulations with Spice2, Spice3, Spice Opus and NGSpice. SpiceOpus Spice Opus is alive and well, just the link changed. An AM modulator circuit running on Spice Opus.