Chris & Sean Thomas
     Thanks guys for the help. Sean Thomas- that's what I wanted to here. I
was only interested in increasing the transformer constant but if the
current design will be ok for <30 hz then I'm happy. I will check out the
reference.The Radio Shack speaker coil that I've incorporated in a built
smt8 style sensor works well. I guess one could use two if one wanted to
pull his hair out with twice the clearance concerns. :}
Regards
Barry



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