How to Build a Hydrophone
Page 6

Strip both ends of two of the insulated #24 wires (make sure you have two different colors, i.e. orange and white). Connect the wires as follows: One end of the insulated #24 wire to the audio cable signal wire (white to white) One end of the other colored insulated #24 wire to the ground wire from the audio cable (orange to ground) Power from the audio cable to the wire from (+) end of the battery pack (blue to red)