A very accurate and useful EXCEL psread sheet. Handy for TC coil use. And tips for Primary construction with copper tube.
http://members.aol.com/esondrmn/index.html
http://www.radiodetection.ca/docs/part3.pdf
usage techniques and application notes
http://www.ostgate.com/riserbond.html
Battle tested and engineered electronics and mechanics for all of the robot sports.
http://www.teamdelta.com/elect.htm
maintaining stability in high-order PLLs can be a chore unless you know exactly what you are doing.
http://www.edn.com/archives/1994/060994/12df3.htm
Application notes from Tektronics.
http://www.tek.com/Measurement/cgi-bin/framed.pl?Document=/Measurement/App_Notes/indexes/oscilloscopes.html&FrameSet=oscilloscopes
http://www.shout.net/~wildixon/
http://www.charlesindustries.com/main/te_coils.html
replacing amplifier tube with FET
http://www.ethanwiner.com/U47-FET.html
http://www.techlib.com/electronics/telephone.html