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 Equipment used in this research consists of a McGreevy VLF receiver, three Op-Amp receivers for VLF, ELF and ULF, my induction coil for the Magnetic field and vertical  for the Electrical Field. Schematics for the McGreevy receiver may be found below.

  http://www.triax.com/vlfradio/bbb4b.htm

                                             VLF / ELF / ULF Receiver Schematics