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eCircuit Center
This site is not electronics theory from the ground up (there are plenty of great textbooks already in print!) This site attempts to provide what I've always learned best from - informal, hands-on and fun experiences that lead to a deeper, more intuitive understanding of circuit design and analysis.
preview: http://www.ecircuitcenter.com  

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EE Circuits Archive
Information on the EE Circuits Archive Circuits Data Sheets Models Microprocessors Text Files Software Reading Capacitors Resistor Codes Related Links Digital Design Links of Interest. This is a site devoted to expanding the availability of circuit designs to engineering students, and even engineering professionals. The idea for this database came from Jerry Russell's search for circuit designs for guitar sound effects.
preview: http://www.ee.washington.edu  

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Electronic Circuits & Diagrams
Electronic circuits, kits, do-it-yourself, circuit diagrams, design and electronics hobby schematics This site contains lots of FREE electronic circuits (schematics) & do-it-yourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few.
preview: http://www.electronic-circuits-diagrams.com  

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Electronicsinfoline.com
A large directory of free electronics schematics. New circuit, datasheet, project idea, technical articles and related products are posted every week. Also has a directory of electronics info on the Web.
preview: http://www.electronicsinfoline.com  

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The Spice Page
SPICE is a general-purpose circuit simulation program for nonlinear dc, nonlinear transient, and linear ac analyses. Circuits may contain resistors, capacitors, inductors, mutual inductors, independent voltage and current sources, four types of dependent sources, lossless and lossy transmission lines (two separate implementations), switches, uniform distributed RC lines, and the five most common semiconductor devices: diodes, BJTs, JFETs,...
preview: http://bwrc.eecs.berkeley.edu