Earlier this year I was so stoked to find bats flying around in my neighborhood at twilight and even right out my front yard. And then recently I found this cheap bat detector kit and I’m doubly stoked. It’s ultrasonic!
It took me several nights to get the frequency dialed in and tonight I finally got a good lock, and I’m even more stoked that I managed to capture it in a halfway decent video! 🦇

https://youtube.com/shorts/a8z74No-91g?feature=share

#bats #ultrasonic #BatDetector #twilight

Listening to Bats As They Search For Food - The range of human hearing goes up to about 20 kilohertz, which is fine for our pu... - https://hackaday.com/2023/07/14/listening-to-bats-as-they-search-for-food/ #timeexpansion #raspberrypi #batdetector #heterodyne #ultrasonic #op-amp #sound #pico #bat

Found this interesting article about turning a #batdetector circuit into a #directconversion #receiver. It uses the #CD2003 radio chip.
I happen to have this very same bat detector so it is interesting to see how it works. Normally it mixes down signals from an ultrasonic transducer but it does that just as well with radio signals from an antenna 😋

http://www.elektronik-labor.de/HF/DirektMixer2.html