A purchasing guide for all sorts of electronics, and mechanical parts. Most of the sellers list5ed will have very small minimum orders. Very useful.
http://www.ee.surrey.ac.uk/Workshop/advice/misc/buy.html
Specifications for 74, 74S, 74ALS, 74F, 74HC, 74AC, and 74ACT chips. All in a handy chart format.
http://www.ee.washington.edu/circuit_archive/parts/74xxspec.html
Links to manufacturers of parts and components. Data sheets and application notes search.
http://www.hills2.u-net.com/electron/eleclink.htm
Application Notes, mostly RF. A lot of basic information about RF test equipment. You have to type application notes in the search window, click go to see the applications notes.
http://www.rohde-schwarz.com/Homepage
Application notes, index.
http://we.home.agilent.com/cgi-bin/bvpub/agilent/search/r2v2/generalSearchResults.jsp?searchInterestArea=000&searchString=application+notes&NAV_ID=-11144.0.00&LANGUAGE_CODE=eng&COUNTRY_CODE=ZZ
Application notes and data sheets on a variety of crystal oscillators and their design.
http://www.ofc.com/downloads.htm
Several years ago National sold several product lines to Fairchild. Here is a list of the products and links to the data sheest on the Fairchild web site.
http://www.national.com/fairchild/part-CD4.html
By manufacturers of electronic parts.
http://www.eio.com/eio_datasheets.htm