THE TECHNOLOGY’S EFFICACY. YEAH. WHEN IT COMES TO KEEPING SCHOOLS SAFE, SECURITY EXPERTS TELL ME A METAL DETECTOR ALONE IS NOT ENOUGH TO PREVENT WEAPONS FROM GETTING INSIDE. ACCORDING TO OFFICIALS ...

[mircemk] is quite a wizard when it comes to using coils of wires in projects, especially when their application is within easy-to-build metal detectors. There are all kinds of ways to send signals ...

On the coldest morning New York City has seen this winter, a stream of teenage students hit a bottleneck at the front of a Brooklyn school building. They shed their jackets, gloves, and belts, ...

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.

It’s very simple to implement a valid metal detector with good performances. Very often people lose their metal objects at the beach or in the countryside. Coins, rings and necklaces disappear when ...