Dear Russell,

I made this incredibly simple circuit, which produces clicks at a
frequency proporational to a resistance in the circuit:

http://www.algonet.se/~petere1/rft-ls.gif

It works surprisingly well even though there are almosty no components!,
and you can pick up the clicks on a standard FM radio on a part of the
dial where there's no station. I haven't managed to figure out a way of
converting the frequency of the clicks back into the original signal,
but it should be possible.

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: kirtley@cua.edu
http://engineering.cua.edu/biomedical

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