From Open Circuits
 Software design tools
Some people still build circuits without ever using any software tools. For complicated circuits, software design tools can save a lot of time.
This section is being reorgnized and expanded, it may be a bit messed up for a few days.
The design tools fall into several classes:
 Schematic Capture
Listed in Class as SchCap
 PCB Layout
Listed in Class as PCB, generally includes a footprint editor to make new parts.
 Circuit Simulation
Listed in Class as CirSim.
Other tools that do not fall in the classes above
"Suites" that combine schematic capture, component editor for the components used in schematic capture, circuit simulation, PCB layout, autorouter, and footprint editor for the footprints used in PCB layout. A suite can be nice as you need draw the circuit only once.
Quite often people mix-and-match tools -- using a schematic capture from one suite to generate pretty schematics and a netlist, then importing the netlist a third party Specctra autorouter, then importing the result into a PCB layout program from another suite for the final manual clean-up and design rule checking. For this to work the tools must have compatible import and export tools.
(Is there another place for listing stand-alone tools such as a switching power supply "wizard" and a RF analysis tool? -- yes as this section is not limited to suites [anymore] )
In no particular order:
|*PCB||Liquid PCB||Linux, Win32||GPL||no||Liquid PCB wiki at SourceForge Liquid PCB is a computer aided design application for designing printed circuit boards. You are not restricted to straight tracks and 45º angles, you can draw tracks any way you like. The tracks will move and bend as required to maintain your design rules. It is open source, and still in the Alpha stage.|
|*PCB||gEDA||Linux, *BSD||Free, OSS||autorouter||This may be the goto open source tool for schematic capture through PCB. Generally does not run on Windows. There are no restrictions on the package to cripple it for a paid version. Boards may be very big. Would be nice to have a full review sometime. gEDA wiki includes schematic and PCB for makeing gerbers etc...|
|*PCB||McCAD EDS Lite||MacOSX, Win32||Free demo max 200 pin||autorouter||Free demo version available for download, 200 pin limit|
|*PCB||McCAD EDS SE||MacOSX, Win32||"free"?||autorouter||Free with book, "Apple I Replica Creation". Supports 750 pins, 11"x17" sheet size, 6-8 data layers. <tangent>(any useful tips in this book for those who want to build a CPU from scratch?) <reply>No, there are not. The book is more entry-level. - Tom Owad</reply></tangent>|
|*PCB||FreePCB||Win32||GPL||can use FreeRoute||PCB Design Software|
|*SchCap||TinyCAD||Win32||LGPL||n/a||Schematic Drawing Software. TinyCAD wiki.|
|*SchCap, PCB||KiCad||BSD, Linux, MacOSX, Win32||GPL||autorouter||Free and open-source. http://www.lis.inpg.fr/realise_au_lis/kicad/ EDA suite ; KiCad wiki. KiCadHowTo.org (Help and tutorials)|
|*SchCap *PCB||Express SCH/PCB||Win32||Free use crippleware||?||ExpressPCB's propietatary free schematic capture & PCB layout designer locking you to use ExpressPCB for manufacture explicitly. Manufacture in 3 business days of two boards for ~100 USD.|
|*PCB||Protel DXP||Win32||autorouter||independent Protel users FAQ; Protel users wiki|
|*tbd||Eagle Eagle Links||Win32, Linux||Free use crippleware|| ( Russ Hensel says>> ) I have been kicking around as a hobbyist for a while and Eagle seems to be the main hobbyist circuit/pcb cad program. It supports schematics and board layout with an auto-router. The free version can easily support 2 dual op amps with wide traces and a one sided board. There is quite a lot of info on the Internet and many projects supply eagle files. There is also a $125 non profit version supporting larger boards. It then gets expensive. Eagle is not really easy to learn: cut for it would be copy in almost any other program. It probably deserves a page or more of its own. ( << end RH ) |
Eagle tutorial from Sparkfun
Eagle tutorial (makezine)
|*tbd||DipTrace||Crippleware||250-pin Freeware or Purchase more advanced versions|
|*tbd||WinQcad||Crippleware||Demo with max 499 pins available for download|
|*tbd||Rimu Schematic and Rimu PCB||Win32||Payware||Schematic & PCB design for MS-Windows|
|*tbd||SuperCAD and SuperPCB||Win32||Mental Automation schematic & PCB for MS-Windows|
|*tbd||autotraxeda.com||AUTOTraxEDA needs MS-NT, won't work on MS-W98/ME. User forums have shown a certain lack of satisfaction with the program.|
|*tbd||holophase.com/dleval||Win32||Crippleware||Circad's DOS version is free for non-commercial use.|
|*tbd||geda.seul.org||BSD, Linux, MacOSX||GPL||autorouter||xNIX Electronic Design Automation project has Schematic capture with PCB CAD.|
|*tbd||vutrax.co.uk/pricing||Win32||autorouter||Vutrax for MS-Windows. Free for under 256 component pins.|
|*tbd||interactiv.com||Electronic Workbench, 400 USD for 500 pins. Includes schematic capture and simulation, virtual instruments and PCB layout. Said to be stable.|
|*tbd||Harry Eaton's PCB||BSD?, Linux?, MacOSX?, Win32||GPL||autorouter||PCB design program which can work under any POSIX compliant operating system like Linux (or BSD under API compability layer). Have Gerber and PostScript output options.|
|*tbd||labcenter.co.uk||They have a lite version "PIC bundle" ~149 USD includes schematic + simulation + pcb layout. You can write pic code for your pic schematic design and simulate. Even multi-pic, keypad, lcd display. Right now it can only simulate PIC16x83, PIC16x84 (lite version limited to 1k program code). Working on more pic modules. Will not produce Gerber or Excellion drill files. Only dxf, bmp, hpgl, tiff output (not sufficient!).|
|*tbd||ivex.com||Payware||Winboard PCB Layout, now calcentron.com.|
|*tbd||illuminated.com.au||Linux, Win32, DOS||Draftcad, Schematic Capture and PCB Design|
|*tbd||"PCB ARTIST"||Win32||?||schematic + layout. Seems to lock you into using Advanced Circuits for manufacture (?).|
|*tbd||PCB123||Win32||?||schematic + layout. Seems to lock you into using Sunstone for manufacture (?).|
|*tbd||ProSchematic||Win32||"free trial"||no||can make schematics that look almost like photographs of a solderless breadboard.|
|*CirSim||Spice||Various||Various||na||The generic term for many simulation programs.|
|*CirSim||LTSpice||Windows||free||na||A free version of Spice from Linear Technology. Draw the schematic and see its simulations. Many components. Seems to be very popular. Should ( will ) have a page here of its own.|
|* PCB||PCB 3.0|
|* PCB||VeeCAD||autorouter||VeeCAD Stripboard Editor|
|* CirSim||Java Breadboard Simulator|
|* SchCap, PCB||Fritzing||autorouter|
|* CirSim||GarlicSim||Windows, Linux||mostly LGPL2.1|| If you want to write a circuit simulator or a microcontroller simulator, GarlicSim may be a nice starting point.
|* SchCap, PCB||DesignSpark PCB||Windows, WINE||freeware||autorouter|| seems to require some kind of on-line activation?
(Some of this information in this table came from the list of software design tools at the Massmind).
A SourceForge search for "schematic" lists dozens of tools. Other than the ones already listed above, what tools in that list are useful for open circuits?
Is there any way to objectively compare these tools? How well did they do at the PCB Top Gun contest ?
- GTKWave Electronic Waveform Viewer http://intranet.cs.man.ac.uk/apt/projects/tools/gtkwave/
- TimingTool http://www.timingtool.com/
When you want to post a picture of a schematic or timing diagram on a web site, should you use JPEG or PNG? I hope these 2 pictures answer your question:
 Circuit simulation tools
Should this be integrated into the above list? Or should this be split out into a separate page?
Which kind of circuit simulation tool is most appropriate for experimenting with various relay CPU configurations?
In no particular order:
 analog electronic simulators
Quite Universal Circuit Simulator (Qucs) is a open source electronics circuit simulator software released under GPL. http://en.wikipedia.org/wiki/Quite_Universal_Circuit_Simulator
gEDA is an open-source suite that comes with, among many other tools:
- ngspice, a mixed-signal circuit simulator based on: Spice3f5, Cider1b1 and Xspice.
- Gnucap is the Gnu Circuit Analysis Package, designed for mixed-mode simulation.
- gspiceui (GNU Spice GUI) provides a GUI for GNU-Cap and Ng-Spice.
"Oregano is a schematic capture and circuit simulation program using the GNOME libraries. Coupled with ngspice, it can do DC sweeps, AC Sweeps, Time domain analysis, and Fourier analysis. All kinds of good stuff, and GPL licensed to boot." http://www.electronicschat.org/index.cgi/Oregano http://en.wikipedia.org/wiki/Oregano_%28software%29
"Can you simulate a schematic?" http://electronics.stackexchange.com/questions/4866/can-you-simulate-a-schematic
Circuit simulation software http://electronics.stackexchange.com/questions/7022/circuit-simulation-software
What are the freeware SPICE simulators available? http://electronics.stackexchange.com/questions/1206/what-are-the-freeware-spice-simulators-available
Program for simulating circuits on linux http://electronics.stackexchange.com/questions/12400/program-for-simulating-circuits-on-linux
NSPICE, a Forth Package to Simulate Electronic Circuits http://home.claranet.nl/users/mhx/nspice.html
Gnucap is the Gnu Circuit Analysis Package. The primary component is a general purpose circuit simulator. It performs nonlinear dc and transient analyses, fourier analysis, and ac analysis. Gnucap is not based on Spice, but some of the models have been derived from the Berkeley models. http://freeelectron.net/gnucap/ http://directory.fsf.org/project/gnucap/
Hans Summers. "Huff & Puff Oscillator Stabiliser Frequency Simulator" (source code in Java can be downloaded here) http://www.hanssummers.com/huffpuff.html
 digital electronic simulators
tkgate open-source gate-level schematic entry and simulator http://www.tkgate.org/
The Iowa Logic Simulator: a tool for modelling digital systems. http://www.cs.uiowa.edu/~jones/logicsim/
FGDIANASYM digital simulator http://www.germinara.it/fgdianasym.htm
 microcontroller simulators
A Really Basic Guide to the PIC Microprocessor and BoostC describes how to use the PIC simulator included with BoostC.
[PIC simulators] "Hades includes simulation models for ... the 8-bit PIC16 microcontrollers ..." http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/index.html
[PIC simulators] miSim DE 2.1 is now FREE miSim DE 2.1 development environment ... It includes an editor, assembler and disassembler ... a simulator that simulates not only the microcontroller itself, but also devices connected to it in real time - from simple switches and LEDs to video displays and stepper motors. ... Also runs as web Applet http://www.feertech.com/misim/welcome.html
[68HC11 simulators] "THRSim11, ... allows you to edit, assemble, simulate and debug programs for the 68HC11 on Windows 95/98. THRSim11 simulates the CPU, ROM, RAM, all memory mapped I/O ports, and the on board peripherals." http://www.bdti.com/faq/3.htm
 visual diff tools
"Visual Diff Tools Revisited" 
"The Power of Visual Diff for Schematics & Layouts" 
(Didn't DavidCary write up a description of "blink" alt-tab comparing files somewhere?)
 Further reading
- hardware tools
- Even though PCB part of a stripboard circuit was more or less "finished" years ago, some people use the above schematic and PCB layout tools to design and document the parts placement for new gadgets built on stripboard.
- A similar list of software tools at RepRap: CAD software for electronics lists tools that people working on the RepRap project have found useful. (Have we already listed all those tools here?)
- Yet another list of electronics software tools at Electronics and Robotics: circuit simulation and PCB design. (Have we already listed all those tools here?)
- "Good Tools for Drawing Schematics"
- PCB Convertor for SketchUp is now open-source.