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149 lines
4.4 KiB
HTML
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<h3>
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<A HREF="../index.html">Tools</A> → Symbols
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</h3>
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</div>
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<!--[if lt IE 7.]>
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<script defer type="text/javascript" src="../../pngfix.js"></script>
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<![endif]-->
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<div id="main">
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<CENTER>
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<H2>
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symbols<br>
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Schematic Symbols
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</H2>
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</CENTER>
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<H3>
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<A HREF="#whatis">What are schematic symbols?</A><BR>
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<A HREF="#how">How do I create new schematic symbols?</A><BR>
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<A HREF="#contrib">How can I contribute/share my symbols with the gEDA community?</A><BR>
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<A HREF="#download">Where can I download it?</A><BR>
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<HR>
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<H4>
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<A NAME="whatis"></A>
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What are schematic symbols?
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</H4>
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<p>
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Schematic symbols are an abstract representation of the physical components
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used in electronic circuits. A physical component can be an intergated
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circuit (IC), a passive device (like a resister), an active device (like
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a diode or transistor), etc... Basically a symbol is the representation
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of the component on a schematic sheet.
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</p>
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<p>
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gEDA/gaf includes a symbol library of over 1600 symbols. The file format
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for the symbols is in an easy to understand ASCII format and is the
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exact same file format as schematic files.
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</p>
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<H4>
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<A NAME="how"></A>
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How do I create new schematic symbols?
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</H4>
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Even though the gEDA/gaf symbol library is not tiny, you will probably
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have to create symbols for the devices that you want to use in your
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circuit designs. There are three ways of creating schematic symbols:<p>
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<UL>
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<LI> Use gschem to draw the symbols. This is the most common and popular way. Please be sure to read the <A HREF="http://wiki.geda-project.org/geda:scg">Symbol Creation Document</A> on guidelines and tips for designing and drawing symbols.</LI>
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<p>
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<LI> Use one of the symbol creation programs. There are several programs out there which take as input a text file describing the symbol and as output generate schematic symbols. Two popular symbol generators are: gmk_sym and tragesym. Both of these symbol generators are part of gEDA/gaf's <A HREF="../utils/index.html">Utilities</A>.</LI>
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<p>
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<LI> The final option is to create symbols with a text editor. The file format of the symbols (and schematics) can be found in the <A HREF="http://wiki.geda-project.org/geda:file_format_spec">File Format Document</A>. Also be sure to checkout the <A HREF="http://wiki.geda-project.org/geda:master_attributes_list">Master Attribute List</A> document.
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</UL>
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<p>
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<H4>
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<A NAME="contrib"></A>
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How can I contribute/share my symbols with the gEDA community?
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</H4>
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At one time, the gEDA Project accepted symbol contributions which would be
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bundled into the main gEDA/gaf releases. However, due to the large number of
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submitted symbols and the consequent need for the project maintainers to
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process and check the submissions, this contribution
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method is now deprecated. Nowadays, if you have symbols you'd like to contribute,
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sign up for an account at <a href="http://gedasymbols.org">gedasymbols.org</A> and submit them there.
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<H4>
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<A NAME="download"></A>
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Where can I download symbols for gschem?
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</H4>
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</ul>
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<li>
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<A HREF="../../download.html">gEDA's download page</A><br>
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</li>
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<li>
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Contributed symbols are available from the
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<a href="http://www.gedasymbols.org/">gedasymbols.org website.</a>
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</li>
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