This circuit conditions different signals of frequency below 1 kHz and displays their waveforms on the PC screen.
http://www.electronicsforu.com/efylinux/circuit/dec2002/circuit1_oscilloscope.pdf
a Pulse-Width-Modulation technique with current feedback to keep the speed of cheap 12V PCB drills more constant
http://www.electronic-projects.net/Electronic-Projects/projects/pcb_drill/index.shtml
http://www.emclab.umr.edu/new-induct/index.html
http://hepso.dna.fi/misc/pcm2902/PCM2902_usb_dac.html
Holland-based amateur presenting station and SSTV information, photos and links.
http://www.qsl.net/pe1rki/index.html
PID-based odometry and dead-reckoning for a mobile robot with differential steering, implemented for a Lego RCX module. Detailed article describes theory of operation. Open Source software written in the NQC language and released under an MIT license.
http://www.seattlerobotics.org/encoder/200108/using_a_pid.html
Modification tips, tricks, and repairs with illustrations and detailed graphics.
http://www.angelfire.com/fl2/cbradiorepair/index.html
http://www.mitedu.freeserve.co.uk/Circuits/Misc/perim.htm
Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in that area. The cable can be buried in a hosepipe or duct and is concea
http://www.zen22142.zen.co.uk/Circuits/Misc/perim.htm
Spoke POV is an easy-to-make electronic kit toy that turns your bicycle wheel into a customized display!
http://www.ladyada.net/make/spokepov/index.html