Hello - this is a friend of mine's kit/design: https://www.tindie.com/products/fourbitindustries/met
Hello - this is a friend of mine's kit/design: https://www.tindie.com/products/fourbitindustries/metal-detector-learn-to-solder-kit/
- maybe it will give you some ideas.
Tindie
Make a metal detector and go hunt for treasure!
