Electronics

http://www.ptable.com/
http://www.uky.edu/Projects/Chemcomics/
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/trans2.html
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npnce.html#c3
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c1
http://www.bcae1.com/
http://www.geofex.com/
http://www.discovercircuits.com/list.htm
http://www.williamson-labs.com/480_opam.htm
http://www.batteryuniversity.com/index.htm
http://www.batteryweb.com/library.cfm
http://en.wikibooks.org/wiki/Electronics
http://www.ngsir.netfirms.com/englishhtm/Amplifier.htm
http://www.ngsir.netfirms.com/englishhtm/RLC.htm
http://www.ngsir.netfirms.com/englishhtm/SpringSHM.htm
http://mysite.verizon.net/vzeoacw1/impedance.html
http://www.nofunclub.org/electra/
http://www.sengpielaudio.com/calculator-filter.htm
http://www.national.com/analog/amplifiers/webench_filters
http://www.physics.uoguelph.ca/tutorials/ohm/index.html
http://www.physics.uoguelph.ca/phyjlh/Fendt/phe/ohmslaw.htm
http://www.chemicool.com/
http://www.falstad.com/circuit/e-index.html
http://sound.westhost.com/articles.htm
http://www.ajdesigner.com/crossover/crossoversecond.php
http://www.beavisaudio.com/
http://www.electronics-tutorials.ws/
http://www.educypedia.be/education/electricity.htm