Real Metal detector Smart Hunter - this app will help you to build a metal detector very easy You will need: 1 - A arduino 2 - A MOSFET irf740 (you can you, any you have disponible MOSFET) 3 - A capacitor 1mF and 0.47mF 4 - A wire ( 0.54 - 0.7 mm ) for the coils. We need make to 2 coils, 80 turns both, of diameter 160 mm both (for more sensibility we need to use biger diameter). 5 - A switch 6 - A handset with mini jack of 4 pins 7 - A resistance of 10 k How it work: MY WEB PAGE : https:/