Do It Yourself Article: A Twenty-Dollar Hydrophone That Anyone Can Build
Text and photos by Robb Nichols
Sea Kayaker August 1998
Despite being inexpensive, this hyrophone performs well. It can easily be built in an evening using generic parts that
can be purchased locally or found around the house. It is also small enough to fit in the pocket of your PFD and simple
enough to deploy in seconds.
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