Hi all,
 I have a question for those analog engineers on the list.  I have been sea=
rching the internet for information on listening to ELF signals.  I have fo=
und some information but not exaxtly what I'm looking for.  For example one=
 site has a circuit of amplifiers and passive filters utilizing either an a=
ntenna or just probes stuck in the ground to receive ELF signals below 50Hz=
..  Another person has a very large coil of wire wound on a spool and just s=
ets it on the ground.  What I would like to do is similar but I'd like to l=
isten to 76Hz which is the US submarine communications frequency.  The Russ=
ians utilize 82Hz.  Is it possible to build a circuit that would pickup the=
 76Hz signal only?  Any information on how to do this if it is possible is =
appreciated.
Thanks,
FJ
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http://www.vlf.it/kurt/elf.html 		 	   		 =20
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