Doortop Stash


You probably don't look at the top of your door often and neither does anyone else. So, hide a doortop stash in this hard-to-find, but easy-to-reach area. Read more »

Tracking Planes with RTL-SDR

Software-defined radios (SDR) are gaining in popularity, and it's not hard to see why — using them, your computer can tune into in an enormous range of frequencies, including FM radio, unencrypted police and fire bands, aircraft transponders, and in many countries, digital TV. Read more »

Battery Testing Tweezers


I’ve always been interested in electronics, but when I started publishing projects professionally, I got interested in photography, too. I soon realized that with BEAM robots and other small “artisanal” circuits, the batteries are one of the largest and most visible components, and which brand you choose — the colors,... Read more »