Choosing a Hydrophone For Field Recording

hydrophone for field recording. Scroll down for a table of commercially available hydrophones, prices, and specifications. Resonant or Flat? I classify hydrophones on a spectrum from resonant to flat. (All transducers resonate at a certain frequency, but in this case…

Hydrophone Experiments II

…Conclusion: Stick with silicone or soft rubber for electret hydrophones. II. Hack Commercial Products After years of extensive hydrophone experiments, Mike Rooke concluded that modifying commercial fish-finders or raw hydrophone elements has advantages over making a hydrophone from scratch. This…

Hydrophone Experiments

…A quick “saucepan test”: http://www.zachpoff.com/site/audio/hydrophone-Test(Saucepan).mp3 Submerged in a sandy freshwater outlet that drains into the beach: http://www.zachpoff.com/site/audio/hydrophone-Rushing-Water.mp3 Buried in the sand (and loudly uprooted by a breaker): http://www.zachpoff.com/site/audio/hydrophone-Sand.mp3 Submerged in a tidal pool: http://www.zachpoff.com/site/audio/hydrophone-Tidal1.mp3 Submerged in another tidal pool: http://www.zachpoff.com/site/audio/hydrophone-Tidal2.mp3…

Hydrophone Review: Ambient ASF-1, ASF-2, Aquarian Audio, JrF

I’ve been building my own hydrophones for awhile, using them alongside inexpensive options from Aquarian Audio and JrF, but I always wondered how much of a difference I would hear with expensive professional hydrophones. I recently had the opportunity to…

Pond Station

…to improve uptime Replaced hydrophone. Stream restored to stereo October 2021 One hydrophone failed. Stream is mono until replaced. May 2021 Replaced (flooded) hydrophones with different design (tuned to resonate at higher frequencies, picks up more surface sounds due to…

Projects in Sound Art - Cooper Union - LP Manipulation

Syllabus: Project in Sound Art

…Sound My experiments with an inductive pickup, listening to Sferics with a VLF receiver, & listening to flies with a light-listener. Mark Vernon’s Domestic Weather, a 60 minute radio art piece that explores radio transmissions as carriers of meteorological data…

Building (or Buying) Contact Mics

…the “Commerical Contact Mics” section below. Aquarian Audio USA Hydrophone manufacturer with several preamps that work great with contact mics. The PA1 is less expensive and can be powered by the low-voltage “plug-in power” from small recorders. The PA-4 is…

Take Apart An Electret Mic Capsule

Recently I was working on a hydrophone project and I needed to figure out how to disassemble an electret capsule and put it back together without ruining it. Robin Whittle has great photos, explanations, and specs concerning some specific capsules…

Cheap Microphones for Ultrasound

This page documents my experiments using inexpensive microphone capsules to record ultrasound signals. I tested several capsules using a 192kHz audio recorder and cheap piezo tweater. For each mic you’ll see a spectrograph showing a frequency sweep through the ultrasound…

Wave Farm Residency 2013

…contact mics. http://www.zachpoff.com/site/audio/trio-for-rain-pots-contact-mics-excerpt.mp3 Sensor Workshop We taught a sensor-building workshop where participants made inexpensive hydrophones, contact mics, and light-listeners to plug into their portable recorders or smartphones. We kept it simple since it was the first time many of the…

Lots of updates to D.I.Y. section

I recently updated the D.I.Y. Resources section of this site: An LED lamp for my workbench made of flexible coolant hose Experiments with hacking FM transmitters to creat reliable short range radio links Adding synchronized digital sound to a Steenbeck…

VLF Natural Radio Experiments

VLF (Very Low Frequency) radio waves vibrate at frequencies that overlap the human hearing range, although we can’t directly hear them. (Our ears sense physical waves rather than electromagnetic ones.) VLF radio is filled with “natural radio” emissions. Every lightning…