An add-on numerical counter that plugs into the headphone jack of 1960s vintage geiger counters such as the Victoreen CDV700 and CDV700-6B. Also works with the Lionel ENI/LENi counters or any other geiger counter having a headphone output pulse greater than -5V.
http://www.solorb.com/elect/geiger/carl/index.html
Describes the process of rebuilding a geiger counter probe from the Victoreen CDV700 geiger counter.
http://www.solorb.com/elect/geiger/geigerprobe/index.html
This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter.
http://www.solorb.com/elect/geiger/cdv700/index.html
http://www.mitedu.freeserve.co.uk/Circuits/Misc/staticdet.htm
http://www.kronjaeger.com/hv-old/radio/geiger/geiger2.gif
http://circuitos.tripod.cl/schem/r29.gif
http://www.corp.direct.ca/trinity/iondetector.html
25-1000 MHz with the NIST dipole-detector
http://www.scott-inc.com/html/nist.htm