Metal detectors are used in everything from airports, event security and landmine clearance, to food safety, scrap sorting and archaeological surveys. The technology is simple and portable, making it ...

If you think of a metal detector, you’re probably thinking of a fairly simple device with a big coil and a piercing whine coming from a tinny speaker. [mircemk] has built a more modern adaptation.

A traditional early project for someone discovering a love for electronics has been for many years a metal detector. This would mean a few transistors back in the day, but today it’s more likely to ...