On 2/13/2010 6:54 AM, AndyS wrote:
Andy writes:
...
Thanks in advance for anything anyone here can suggest...

Andy W4OAH in Eureka, Texas


Well, I can suggest PPM's are kewl! (Proton Precession Magnetometers)
But, I probably would not get much thanks for that ...

So:

http://prints.iiap.res.in/bitstream/...1/BHARGAVA.pdf

The above gives complete circuitry. Unfortuantly, the preamp is
tube--so the complete unit ends up a hybrid. I would substitute Fets
for the tubes.

http://www.ilotresor.com/prospection...n_protons.html

The above offers some good ideas--click the pictures (small images) on
it for relevant pages and info. Sensor construction data also.

.... and ...

http://www.copperwood.com/carlandjerry.htm
.... you did mean this Carl and Jerry, right?

Regards,
JS