How to measure practically any quantity, electrically.
http://www.picotech.com/measure.html
AT90S8515 based tiny web server
http://www.picoweb.net/download/8019avr51.pdf
circuit takes care of lighting the appropriate LED to indicate the winner
http://www.aaroncake.net/circuits/race.htm
By David O'Halloran. The Welchel phase-rotation FFT is a new form of the fast Fourier transform (FFT) that replaces data movement at runtime with equivalent multiplications by precomputed constants. The result is an FFT that is easy to pipeline.
http://www-2.cs.cmu.edu/afs/cs.cmu.edu/project/iwarp/member/fx/public/www/phase1.html
http://sami.ticalc.org/e_pxpand.htm
Westcoast printed circuit board design bureau. Analog & digital layouts for over 10 years.
http://www.members.shaw.ca/pjpwb
The most bizzare type of speakers with phenominal sound quality. Extremely clear and open sound; Perfect transient response; no Doppler distorion; extension to 60khz!....
http://www.ece.villanova.edu/~cdanjo/plasma.html
This shows how to get sound from computer to telephone line. A circuit that would let you connect any Mac to almost any phone circuit.
http://www.dplay.com/tutorial/Mac2tel.html
Piece-wise Linear Electric Circuit Simulation is a Simulink blockset for the seamless integration of electrical or power electronic circuits into Simulink models.
http://www.eeh.ee.ethz.ch/plecs/
for 10 GHz
http://www.mrs.bt.co.uk/dubus/8603-1.pdf