https://hackaday.com/wp-content/uploads/2022/04/metal-detector-main.png?w=800
Nice build. It seems to work pretty good to. My 2 cents…I think I would just buy a used one myself.
https://hackaday.com/2022/05/02/diy-metal-detector-gives-you-the-mettle-to-find-some-medals/