Hydrophone Experiments II

I started experimenting with inexpensive DIY hydrophones awhile ago. This update discusses encapsulation, commercial hydrophone elements, and modifying a Primo EM172 capsule for underwater use.

Hydrophone Experiments

An underwater microphone using a common mic capsule and silicone sealant. It has relatively flat frequency response without the resonant “honk” of the piezo disc used in most DIY hydrophones.

Exploring Ultrasound

Experiments with recording ultrasound bat calls using the built-in mics of the Roland R-05 portable recorder.