Technical drawings, photographs, subsystems breakdowns, and pictures from a recent competition.
http://gaia.ecs.csus.edu/~wongbi/
This site spotlights my testbed robot named "OR". There are a few tips for starting your own robot.
http://wonderdog5.tripod.com/id7.htm
Review of the solar system simulator (by Spacetech) for RISC OS workstations.
http://www.harmsy.freeuk.com/orrer.html
http://members.tripod.com/michaelgellis/scope/sweep.html
A brief primer, and then tips on oscillator design and construction.
http://www.electronics-tutorials.com/oscillators/oscillator-basics.htm
http://www.rlocman.com.ru/am/a02009.htm
this low-distortion crystal oscillator is essentially a modified Clapp oscillator that uses a four-transistor voltage follower instead of a single transistor and connects the crystal to a virtual ground
http://www.edn.com/archives/1994/081894/17di1.htm
simple arrangement of active-R oscillators can generate an excellent triangular waveform
http://www.edn.com/archives/1995/033095/07di3.htm
http://members.tripod.com/michaelgellis/scope/vert.html
http://members.tripod.com/michaelgellis/scope/switch.html