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An intermediate switch can, however, be implemented by adding appropriate external wiring to an ordinary (six terminal) DPDT switch, or by using a separate DPDT relay. By connecting one or more 4-way (intermediate) switches in-line, with 3-way switches at either end, the load can be controlled from three or more locations.
Free and open source software. Transparent source that is diffable. Mathematical formulas and text are nicely typeset. Vector graphics output (PDF, for example). If you already use LaTeX for preparing documents, drawing circuit diagrams is relatively easy to learn. Disadvantages: If you are new to LaTeX, the learning curve is pretty steep.
List of free analog and digital electronic circuit simulators, available for Windows, macOS, Linux, and comparing against UC Berkeley SPICE. The following table is split into two groups based on whether it has a graphical visual interface or not.
This circuit diagram was created with Inkscape. This SVG circuit diagram shows a very simple image. Drawing uncomplicated graphics with a text editor seems more adequate than using a vector graphics program, and will often result in a dramatic reduction of file size.
Dia has special objects to help draw entity-relationship models, Unified Modeling Language (UML) diagrams, flowcharts, network diagrams, and simple electrical circuits. It is also possible to add support for new shapes by writing simple XML files, using a subset of Scalable Vector Graphics (SVG) to draw the shape.
Qucs consists of several standalone programs interacting with each other through a GUI. The GUI is used to create schematics, setup simulations, display simulation results, writing VHDL code, etc. The analog simulator, gnucsator, is a command line program which is run by the GUI in order to simulate the schematic which you previously setup.
Besides basic drawing and visualization capabilities, modern schematic editors typically provide the following capabilities: Capture electrical properties and other attributes of components, wires, nets and pins. Hierarchical way of design. Generate netlists and other common representations of the designed circuit from schematic.
A DPDT switch has six connections, but since polarity reversal is a very common usage of DPDT switches, some variations of the DPDT switch are internally wired specifically for polarity reversal. These crossover switches only have four terminals rather than six. Two of the terminals are inputs and two are outputs.