Building OPA Impedance Buffers

completed Alice Mini board

Hot air reflow is so much easier than I thought it would be. The trick to getting everything placed correctly is to eat a good breakfast and not drink too much coffee. I am using these OPA “Alice” circuits in the hydrophones, dual impedance buffers, and Sound Urchin XLR products. They use a high definition, … Read more

Field Recording: Croaker sounds on the first day of Spring 2024

Most Croakers are gregarious, community animals and make noise by way of oscillating their swim bladder as part of their spawning ritual. The swim bladder is a pocket of air inside most fish that helps keep them afloat and facing upright. Male croakers use this sound to attract females. Being the first day of Spring … Read more

Meal Worm Action: Using the Dual OPA Buffer

meal worm sounds

Headphones Recommended – Just a fun little sound experiment with our lizards food. I attached 2 – 35mm piezos to a small tub of meal worms via my Dual OPA field buffer and then into the trusty Mix Pre 6 II – kind of what you would expect, lotsa scratchy little legs in the saw … Read more

POTAR Design Devices