Try a AD7822 for a start. Here is an article from Maker Pro talking about such a circuit: /How to Make a Circuit That Detects High Frequencies: The Bat Detector!/: https://maker.pro/pcb/projects/how-to-build-your-own-bat-detector
Also check out: /A Simple Bat Detector based shield for the Arduino Uno .../ https://duino4projects.com/simple-bat-detector-based-shield-arduino-uno/ Nuts & Volts Magazine explored bat detector circuits: /Build A Bat Detector/: https://www.nutsvolts.com/magazine/article/june2011_berber There was an article in Elektor Magazine of such a circuit: /Bat detector with amplitude recovery: The main features and specifications are:/ /hybrid analogue and digital circuitry, low current consumption - less than 5 mA/ /in standby, selectable division ratio, etc./: https://www.elektormagazine.com/labs/bat-detector-with-amplitude-recovery plus a user reviewing the circuit: http://www.speleogroup.org/Bat_detector.html and previously https://www.elektormagazine.com/magazine/elektor-201607/29128 and an older version https://www.elektormagazine.com/magazine/elektor-199504/33298 The preamplifier circuit you would need prior to the ADC is described here: https://www.elektormagazine.com/magazine/elektor-141/57147 And they even made a kit available: https://www.elektor.com/bat-detector-kit There's some thoughts in the All About Circuits forums using the right ADCs: /Bat Detector Design/: https://forum.allaboutcircuits.com/threads/bat-detector-design.33210/ On 10/26/20 5:35 PM, Martin Brooke via TriEmbed wrote: > I wish for a high data rate 16-18 bit ADC module like this > https://www.adafruit.com/product/1085 > maybe using I2S to get the data rate up to where it would work for ultrasound > 192 ksps or higher would be ideal. > > If it would work with a modern higher clock rate arduino or a RPi that would > be perfect. > > I would deploy them to record sounds of bats in the rainforest canopy and > collect the data with WiFi. > > There would be many other uses. Hydrophones, HiFi recording, > > Right now the gear to do this is really expensive > > https://www.wildmountainechoes.com/equipment/options-for-recording-ultrasounds/ > > -- Scott G. Hall Raleigh, NC, USA [email protected] /Although kindness is rarely a job, no matter what you do it's always an option./
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