http://chaokhun.kmitl.ac.th/~kswichit/rtc/rtc.htm
It is a digital clock which make use of AT89C4051 to work as a Real time clock.
http://chaokhun.kmitl.ac.th/~kswichit/Ajay/clock.html
http://www.stanford.edu/class/ee281/projects/aut2001/digitalcookbook/schematic.pdf
This simple piece of equipment is based on a PIC16C84 microcontroller, and uses an AD9850 DDS to generate the sinewave output.
http://users.on.net/~merrifield/freq/index.html
The idea is to let a text scroll over the LED dot-matrix displays.
http://home.wanadoo.nl/electro1/avr/dotmatrix.htm
A DIP40 chip, specifically, my PIC18F452 microcontroller, takes up too much space on a single breadboard. Here is the solution for such a situation.
http://feelslikeburning.com/2005/10/19/make-a-solderless-breadboard-carrier/
http://www.solorb.com/gfc/elect/reset/index.html
This circuit allows a remote microprocessor to be reset by a controlling host over a remote RS-232 or similar protocol serial line. With the use of a program loader on the remote host, a program may be downloaded and run.
http://www.solorb.com/elect/reset/index.html
http://www.rfcafe.com/references/electrical/microstrip_eq.htm
http://www.edn.com/archives/1996/102496/di_04.htm