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There is freie Schaltzeichen OpenOffice extension, works in LibreOffice too, that adds couple of hundred circuit diagrams symbols.

It is hosted on reputable Google Code.

The project's website is in German. Download the english version 1.3 of extension from here, although german one is newer being 1.4 and can be downloaded following this link.

Install it in LibreOffice by going to Tools → Extension Manager → Add and opening downloaded file.

After installation, for optimal results it is advised to set following options in Draw located under Tools → Options → LibreOffice Draw → Grid:

  • Horizontal and Vertical Resolution to 0,25 cm
  • Horizontal and Vertical Subdivision to 1 space

New symbols can be accessed from appropriate themes in Tools → Gallery.