Gladys DIY Hydrophone Kit. https://www.instructables.com/The-Gladys-Hydrophone/
Includes:
- P48 Buffer PCB
- Piezo Cylinder
- 5" of copper grounding wire
- 3d printed mold for casting
- 3d printed endcaps for sealing the cylinder and fixturing PCB
- 1.5" 24AWG hookup wire
Sample .mp3 files:
- https://www.jlielectronics.com/content/ToadFish.mp3
- https://www.jlielectronics.com/content/Humpback.mp3
- https://www.jlielectronics.com/content/Iceberg.mp3