====== DIY hydrophones ======

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  * [[http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA420311|Construction and Testing of Low Noise Hydrophones]] by Miguel Alvarado Juarez 
  * [[https://swfsc.noaa.gov/publications/TM/SWFSC/NOAA-TM-NMFS-SWFSC-417.PDF|A guide to constructing hydrophones and hydrophone arrays for monitoring marine mammal vocalizations]] by Jay Barlow, Shannon Rankin and Steve Dawson
  * [[http://www.lukemiller.org/journal/journal_pics/hydrophone/piezo_hydrophone_1995.pdf|A cheap sensitive hydrophone for monitoring cetacean vocalisations]] by ?
  * [[http://www.instructables.com/id/Underwater-Microphone-Hydrophone/|Electret microphone in mineral oil]]

===== Main methods =====
  * Piezoceramic sensors (disc – basic, cylinder and other shapes - advanced)
  * Electret microphone in mineral oil ([[http://www.instructables.com/id/Underwater-Microphone-Hydrophone/|example]])
  * Water proof speaker used as underwater transducer