https://www.hackster.io/pablotrujillojuan/single-tone-detector-with-genesys-zu-and-rtu-728c3f
Single Tone Detector with Genesys ZU and RTU - Hackster.io
Using Eclypse Z7 to generate an FSK signal and Genesys ZU for implement a single tone detector algorithm executed in the RTU. Find this and other hardware...
tone detectorsinglegenesyszurtu
https://metaldetectorhelpers.com/pro-metal-detector-kit-quick-silver-8-coil-3-tone-digital-display-gold-finder.html
Pro Metal Detector Kit Quick Silver 8 Coil 3 Tone Digital Display Gold Finder
metal detectorquick silverdigital displayprokit