> Can you tell me what software you used for creating the
> schematic?

The individual symbols were drawn with MS Paint. As posted
previously, the set so far is here

http://home.clear.net.nz/pages/joecolquitt/0symbols.html

It's very simple to copy/paste them together

As I need new components I add them. Making schematics
other ways (eg with Eagle) is OK, I just prefer my little b/w
gifs. I normally include a schematic inside anything I sell (too
often been the shmuck trying to repair something without one)
and find those gifs quite readable, more so than many a jpeg
or pdf

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