DIY “Teensy” Bat Detector
A collaboratively-developed bat detector based on a Teensy microcontroller and MEMS microphone capsule.
Resources
Testing XLR Adapters with Plug-in Power
I’ve been testing a few XLR to 3.5mm adapters that contain a circuit to convert 12-48v phantom power to low-voltage “plug-in power”.
Mic Windscreen for AT BP4025
These files are my attempt to make a compact “blimp” style windscreen for the excellent Audio Technica BP4025 Stereo Microphone. … + More
Cheap Microphones for Ultrasound
Documentation of my experiments using inexpensive microphone capsules to record ultrasound signals.
Sound Devices MixPre-6 Notes
My impressions, tips & tricks regarding the Sound Devices MixPre-6 recorder.
Building A Simple Durable Contact Microphone
My step-by-step guide to building the simplest DIY contact microphone possible (while prioritizing durability and decent frequency response).
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.
Alex Rice Piezo Preamplifier
Alex Rice designed a phantom-powered preamplifier for piezo contact mics and hydrophones. It sounds great but his site is offline. I posted his files and made some changes of my own.
Inductive Pickup Experiments
Use the coil of wire from an old relay to listen to the electromagnetic world of modern machines.
VLF Natural Radio Experiments
“Natural Radio” is the low frequency residue of lightning strikes and space weather. After building a simple preamplifier circuit, you can tune it via the mic input of any recorder.