This revision is from 2018/07/31 15:33.
Professional or marine biology hydrophones are expensive and not quite easy to find. But it is possible to build one using piezo disk for a reasonable price and with decent quality.
The basics of the presented hydrophone is to use two piezo disk together to reduce noise and increase output level. The circuit provide a balanced output and allow the use of great length of cable. It is entended to be used with a XLR phantom powerd input.
Piezo disk are high impedance devices, and although the hydrophone can be used as they are, a dedicated preamplifier can significantly inprove sound quality and improve low frequency responce.
The hydrophones presentent here are inspired by the work of sound artist David Dunn who extensively worked with piezos.
An aquatic live stream from Zack Poff is present on the SOundmap, or here right from the srever.
Last changed 2018/08/03 17:09