Cheap DIY Metal Detector

Posted by Kevin

June 19, 2008

In this video, RazorG shows us how to make a check metal detector using nothing but an old AM radio, some tape, and a calculator. What you want to do, is to turn the volume up to max on the radio and tune it to the high end of the frequency but not directly on a broadcast station as you want to hear static. Once you have done that, position the calculator on the back of it while both devices are turned on. Adjust the position of the calculator until you hear a tone, and then securely tape them together so it can’t move.

That’s all you need to do, you now have a simple DIY metal detector. RazorG says this works because the loud tone coming from the radio is the calculator’s circuit board which produces a radio frequency signal. The radio waves from the calculator, bounce off the metal object and are heard through the radio’s speakers. Check out the video for an explanation and demonstration.