www.web-ee.com
www.electronicsee.com
www.motorcontrol.com
http://ee.cleversoul.com
www.circuitsage.com/tline.html
www.macgen.com/calcul.html
http://ecmweb.com
www.nulec.com.au/misc/gen_inf/glossary.html
www.mathcad.com
http://icmaster.com
www.fillfactory.com/index2.htm
http://microcontroller.com
www.redcircuits.com
www.ee.upenn.edu/rca/software/abel/abel.primer.html
www.iserv.net/~alexx/lib/tutorial.htm
www.softdsp.com/home/home.htm
www.greatrivertech.com/
www.adream.fr/radiocalc/english.html
www.usb.org/developers/docs/
www.sensorsmag.com/
www.techonline.com/