Applications of the most common IC timer chip.
http://www.ee.ed.ac.uk/~kap/Hard/555/aplications.html
Short Tutorial on the Classic Timer, the 555. With animations. Also many other circuits based on 555 chip.
http://courses.ncsu.edu:8020/ece480/common/htdocs/480_555.htm
An excellent extensive tutorial. Includes history, timing and logic diagrams. With numerous replacement guides.
http://www.uoguelph.ca/~antoon/gadgets/555/555.html
A nice 555 Timer Tutorials with good references.
http://www.williamson-labs.com/480_555.htm
This is a very commonly used IC for making simple timing circuits and oscillators.
http://homepages.westminster.org.uk/electronics/555.htm
http://www.uoguelph.ca/~antoon/circ/555test.htm
Soem real handy circuits from Williamson Labs.
http://www.williamson-labs.com/555-circuits.htm
drives 8 Ohm Speaker
http://ourworld.compuserve.com/homepages/Bill_Bowden/page10.htm#tone.gif
provides Spice specific schematic entry, the ability to define and save an unlimited number of analyses, integrated graphing of simulation results plus easy inclusion of Spice and PSpice subcircuits from a user expandable library.
http://www.5spice.com/
hits the small lamp with narrow 1us pulses at a rate of 10KHz, each pulse launches about 10 watts of visible light
http://www.imagineeringezine.com/PDF-FILES/5wlamp.pdf