Advanced Flexible Circuits, Inc.
Design and manufacturing of flexible circuits and membranes for use in control panels of consumer and industrial equipment. Factory in Pennsylvania, USA. Sites lists factory capabilities.
http://www.afcflex.com

Printech Circuit Laboratories
Printech manufacturer of high technology printed circuit boards
http://www.pcll.net/

Lessons in Electric Circuits
Online book by Tony R. Kuphaldt on dc and ac electric circuits, semiconductor devices, analog and digital circuits.
http://www.allaboutcircuits.com/

Electronic Circuits
An archive of electronic circuits divided into categories such as power supplies, auto, computer circuits, sound/radio.
http://www.aaroncake.net/circuits/index.asp

Flex Interconnect Technologies
Flex Interconnect designs, manufactures and assembles flex circuits and rigid-flex circuits
http://www.fit4flex.com

Datex Instruments, Inc.
Datexusa has been a hi-tech electronics manufacturing facility with state-of-art equipment, thumbwheel switches, C&K Switches, pushwheel switches, cherry switches, leverwheel switches, miniature thumbwheel switches, subminiature precision snap-acting, metal cased precision snap-acting
http://www.datexusa.com

Sam Electronic Circuits
Electronic Circuits for the Hobbyist designed by Sam. with full description and diagrams in Greek and English. ÇëåêôñïíéêÜ êõêëþìáôá ãéá ÷ïìðßóôåò. Ðëçñïöïñßåò-äéáãñÜììáôá.
http://users.otenet.gr/~athsam

Lanode
UK's leading DSL, fibre optic and network infrastructure supplier. Lanode also manufacture fibre based secure networking systems for defence applications.
http://www.lanode.com

Quantum Error-Correcting Codes
Tables for: bounds on the minimum distance for given length and dimension; encoding circuits; bounds and circuits for cyclic QECC; bounds and circuits for CSS codes derived from weakly-self dual binary codes.
http://iaks-www.ira.uka.de/home/grassl/QECC/

1st IEEE International Conference on Circuits and Systems for Communications
Topics include questions and problems that are around the theory and design of circuits and systems for communications applications. Signal processing, RF design and microelectronic implementations of such types of circuits and systems are of interest. St. Petersburg, Russia, June 26-28, 2002.
http://www.spbstu.ru/english/conferences/ieee.html