MisterB sent in this video on how to convert a simple toy microphone into a hydrophone to listen to underwater sounds – Link & kit on eBay.

10 thoughts on “HOW TO – Make low cost Hydrophone (listen to fish & whales talk)

  1. Interesting, but a little pricey. You can get ALL of the materials at the dollar store. Total cost of 4 dollars. Thanks for the info though.

  2. Pricey? Perhaps. Kit contains toy microphone, tygon tubing, 12’rubber balloon, non oil based personal lubricant, non hardening modeling clay, cable ties, Q tip, a cd with the complete us navy diving manuals, the us navy underwater salvage manuals, and a how to make money book on ebay all with a money back guarantee.

    A more valid criticism would be the poor photo quality of the video, but then I filmed it with a $39 dollar RCA Small Wonder Digital video camera velcroed to my baseball hat. I truly appreciate the opportunity you gave me to share the video, I hope to do more soon, I can’t thank you enough.

    Robert Moffett

  3. Could anyone post a walkthrough of making a DIY piezo-ceramic hydrophone? Supposedly this can be done by ripping the speaker out of a discarded musical greeting card.

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