Set of two piezo hydrophones + instructions. As the name suggests, these are (contact) microphones used for amplifying sounds underwater! Simple piezo based construction. Instructions include link to tutorial about how to build these hydrophones.
Made and donated by Sasha Leitman.
Wellington Musical Electronics Library
https://wellingtonmel.myturn.com/library/
272 Taranaki Streethttps://wellingtonmel.myturn.com/library/
Wellington
New Zealand