To Make a Metal Detector, You Would Need a Radio and a…
While this won’t work for deep metal detection, it will for shallow metal detection. You’ll need a handheld radio and a simple calculator, placed side by side (a CD or DVD case works great for holding them in place). Turn the calculator and the radio both on. The radio needs to be on an AM station that isn’t putting out anything but static. Slowly fold the radio and calculator towards each other until the radio makes a buzzing noise. It will be different than the normal static, so you’ll notice it right away. Hold the items in this position as you wave them over the ground. When they go over metal, like, say… the earrings your dropped in the backyard, the buzz will change to a higher pitch.