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It was once thought that the oceans were a silent place. However, if you were to drop a hydrophone or underwater microphone into the seas, you would soon discover that the underwater world is quite noisy. A hydrophone picks up acoustic signals and then transfers the sounds into a receiver that allows you to hear them. The following instructions allow you to inexpensively (under $40) build your own hydrophone. Use this hydrophone to hear sounds in your aquarium or go down to the beach and drop it in the water to discover the many different sounds that can be heard underwater.
| Materials: |
| Quantity |
Radio Shack
Item # |
Description |
| 1 |
270-092c |
Condenser Microphone Element** |
| 25+ feet |
278-513 |
Audio Cable, 2 conductors (#24) plus shield** |
| 1 |
274-286a |
two conductor 1/8" mono phone plug** |
| 1 |
277-1008c |
Mini Audio Amplifier/Speaker** |
| 1 roll |
64-2352 |
black rubber electrical tape** (NO PVC TAPE) |
| 1 |
270-402 |
Battery holder, fits one "C" cell** |
| 1 |
23-871 |
Battery, "C" cell, alkaline |
| 3 ft |
NA |
Wire, Insulated, #24. 1 ft each of orange, white, blue** |
| 1 |
NA |
35mm plastic film canister |
| 1/4 cup |
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 Sealant |
| ** These items can be found at Radio Shack |
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