DIY Metal Detector

I don’t know whether kids these days love to look for buried treasure in their own backyard with a metal detector, but I surely had a field day back in my early years. Here’s a way to make your very own metal detector for the more prudent dads who are reading this. All you need is an AM radio, some tape, and a calculator in order to produce a radio frequency signal which can bounce off metal, allowing the radio to produce a rather grating tone. Now if only I can dig out an AM radio with everything gone digital…