Introduction: How to Build a Stereo Hydrophone (not Finished)

A stereo hydrophone system can be used to hear the sounds surrounding your submerged ROV
as if you were on-board.  You will not only be able to hear what is going on around your ROV,
but should be able to hear what direction a sound is coming from.  For this system, we construct
two separate hydrophones and hook them both up to a pair of stereo headphones.  The
hydrophones are mounted on the ROV in a manner that simulates the positioning of human ears,
but adjusted for the speed of sound in water.

On this instructable i'm going to show you how to build Stereo Hydrophone for under $40.


http://seaperch.mit.edu/docs/AdvancedROV/Stereo_Hydrophone.pdf

Step 1: Used For?

A stereo hydrophone system can be used to hear the sounds surrounding your submerged ROV
as if you were on-board.  You will not only be able to hear what is going on around your ROV,
but should be able to hear what direction a sound is coming from.  For this system, we construct
two separate hydrophones and hook them both up to a pair of stereo headphones.  The
hydrophones are mounted on the ROV in a manner that simulates the positioning of human ears,
but adjusted for the speed of sound in water.

Step 2: Stereo Hydrophone Wiring Lay Out

Step 3: What You'll Need!

Quantity Radio Shack
Item #
Description
1 270-092c Condenser Microphone Element**
1 278-513 Audio Cable, 2 conductors (#24) plus shield** 25+ feet
1 274-286a two conductor, 1/8" mono phone plug**
1 277-1008c Mini Audio Amplifier/Speaker**
1 roll 64-2352 black tape, rubber electrical (NOT PVC tape!)
1 270-402 Battery holder, fits 1 "C" cell**
1 23-871 Battery, "C" cell, Alkaline**
3 ft NA Wire, Insulated, #24.  1 ft of orange, white, blue**
1 NA 35mm plastic film canister
1/4c NA Vegetable or mineral oil
1 NA 9V battery for amplifier/speaker**
1 NA Soldering iron and solder**
1 NA Wire stripper**
1 NA Silicone Seal
** These Items can be found at Radio Shack

Step 4: Instructions: Step 1

Strip the end of the audio cable so the three wires are
exposed (blue, white & ground {copper}).  Strip the ends
of the two wires (blue & white) about 1 cm.

Step 5: Step: 2

Strip the ends of the wires connected to the microphone
element, so that three wires are exposed (red, white &
ground {copper}).

Step 6: Step: 3

 Make a hole in the lid of the film
canister about the width of the audio
cable and thread the audio cable
through the hole.

Step 7: Step: 4

Connect the wires by twisting the two together, as
follows:
· Signal from the audio cable to the signal from the
microphone element (white to white)
· Power from the audio cable to the power from the
microphone element (blue to red)
· Ground wire from the audio cable to the ground wire
from the microphone element

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