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Could anyone advise me on the specs for chosing piezo elements for building u/w headphones. These will be used on a vlf circuit( a Tesoro Compadre). I believe the audio output is somewhere around 300 Hz.
These are not headphones but it may be possible to use the waterproof earbud earplugs from this little waterproof radio, to operate on your detector. Maybe adapt these earplugs to some earmuffs.
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