50 MHz information on antennas, beacons, and frequencies provided by PA4PA.
http://www.xs4all.nl/~pb0aln/index.htm
http://www.epanorama.net/documents/lan/rs232_bus.html
http://www.colomar.com/Shavano/midi_cable.html
Theory, construction, and operation of a Marx generator. How to build one and how to make real big sparks with it.
http://members.tm.net/lapointe/MarxMain.html
A Marx Generator produces a short, but very high voltage pulse by charging a stack of capacitors in parallel to a lower voltage and then switching them in series. The switching is usually done by spark gaps.
http://www.ee.ualberta.ca/~schmaus/elect/ftron.html
http://home1.stofanet.dk/hvaba/gameboy/mbc5cpld/cpldcart.html
Software for reliability/availability modeling using Markov modeling, reliability block diagrams
http://www.sohar.com/software/meadep/
By combining the responses of an Analog Devices AD590 temperature sensor and a Humirel HS1101 humidity sensor, you can generate single TTL-level signal containing information from both sensors
http://www.edn.com/article/CA152878.html
relies on a simple test circuit and the single-shot capture & measurement capabilities inherent in digital oscilloscopes
http://www.lecroy.com/tm/library/LABs/lab418/default.asp
http://www.mrs.bt.co.uk/dubus/8802-2.pdf