My friends let's put here the most important websites and ebooks about electronics we can find , of course if you don't mind to do that, first of all here's mine:
Clairex Technologies (mfr. of LDRs)
1845 Summit Ave., Suite 403
Plano TX 75074
972-422-4676 (voice)
972-423-8628 (FAX) http://www.clairex.com
Now a division of Perkin-Elmer **broken link removed**
Perkin-Elmer Optoelectronics (formerly VACTEC and Clarex)
2175 Mission College Blvd.
Santa Clara CA 95054
408-565-0857 (voice)
408-565-0703 FAX) **broken link removed**