National Semiconductor [ http://www.national.com/ ]
National Semiconductor, the industry's premier analog company, creates high-performance analog devices and subsystems.

Sony Support [ http://esupport.sony.com/perl/select-tv.pl ]
Manuales de televisores Sony. En inglés.

Electronics Tutorials [ http://www.electronics-tutorials.com/ ]
Offering free comprehensive basic electronics tutorials in amplifiers, antennas, ham radio, filters, oscillators, power supply, receivers, test equipment, transmitters, radio design and electronics design. Links to data sheets and electronics reference and text books.

Electronic Circuits for the Hobbyist [ http://www.uoguelph.ca/~antoon/circ/circuits.htm ]
Circuits and building projects, Schematics, diagrams, High Voltage projects, Electronics, Tutorials + history.

Bowden's Hobby Circuits [ http://ourworld.compuserve.com/homepages/Bill_Bowden/homepage.htm ]
A small collection of electronic circuits for the hobbyist or student. Site includes over 100 circuit diagrams, links to related sites, commercial kits and projects, newsgroups and educational areas.

All Datasheet [ http://www.datasheetarchive.com/ ]
Electronic component datasheet and data books.

ESI [ http://www.eserviceinfo.com/ ]
Diagramas, manuales, documentación, etc. En inglés

Electronic Kits, Circuits and Projects [ http://www.circuithut.com/ ]
Circuit Hut is a new (and soon to be the best) electronic kit and project information source and magazine for electronics enthusiasts. Circuit Hut is dedicated to providing fresh projects, tutorials and articles on a regular basis and the best part is they are all free.

CXI [ http://www.zen22142.zen.co.uk/ ]
Electronic and Radio schematics,Design,Theory,Circuit Analysis.

4QD-TEC: Electronics Circuits Reference Archive Index [ http://www.4qdtec.com/index.html ]
Muchos circuitos para armar de diversos tipos:Multuvibradores, circuitos para efectos de guitarra, fuentes de poder, circuitos para motores, etc

Sanyo Service&Support [ http://sanyoservice.com/ ]
Servicio de soporte para Sanyo.

Universal Remote Control Codes [ http://www.xdiv.com/remotes/ ]
Manuales de control remotos universales.

RadioLocman [ http://www.radiolocman.com/ ]
Diagramas de TV, Pc, Monitores, etc. En inglés.

Schematics for free [ http://schematicsforfree.mattsoft.net/ ]
Diagramas y manuales para equipos de audio, video, etc. En inglés.

Stereo Manuals [ http://www.stereomanuals.com/ ]
Manuales de equipos de los años 70s. En inglés.

Triode Electronics [ http://www.triodeel.com/schindex.htm ]
Diagramas de equipos a tubos. En inglés.

Amt Electronics [ http://amt.ural.ru/electronics/ ]
Digramas de Tv, Audio y Video. En idioma ruso.

Bravox [ http://www.bravox.com.br/ ]
Cajas acústicas, especificaciones, diseño.

Electronica.ro [ http://www.electronica.ro/ ]
Esquemas de Tv, Audio, Monitores , Impresoras, etc. En italiano.

Bucovalov [ http://www.geocities.com/bucovalov/ ]
Diagramas para equipos Technics, Panasonic, Pioneer, Aiwa, LG, Blaupunkt, etc.