| http://nineplanets.org/meade/1812/1812.html [US] | 12V to 18V Converter |
| http://www.datasheetarchive.com [US] | Big database with many electronic components |
| http://www.elektroda.pl [PL] | The best polish web page about electronic |
| http://www.elektronika.qs.pl [PL] | Good polish page about analog electronic (for begginers) |