This is abandoned.
See Wikipedia:WikiProject_Electronics/Programs#Programs_for_drawing_circuits for a variety of methods of drawing circuits for Wikipedia.
I've been using a web program called klunky schematic editor to draw electronics diagrams for the WP. It just puts a bunch of components in square blocks together into a table. Sometimes I edit the screenshots afterwards for prettiness, but often just leave them the way they are and add text. A while ago I thought "we could just upload the individual blocks to the wikipedia commons itself and then make tables on the fly", but my initial experiment didn't work.
1. Duh. I just had extra whitespace in it. It works fine:
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(That's not a single image:)
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2. I just got the official word from the author a few days ago that he considers the program public domain, so there is definitely no problem with this.
3. The examples above previously used .png files; these have been replaced by .svg files. Only the symbols required for the examples are available in this vector collection, which is not an attempt to produce a comprehensive library.