Fail Of The Week: The SMD Crystal Radio That Wasn’t

The crystal radio is a time-honored build that sadly doesn’t get much traction anymore. Once a rite of passage for electronics hobbyists, the classic coil-on-an-oatmeal-carton and cat’s…

RFID From First Principles And Saving A Cat

[Dale Cook] has cats, and as he readily admits, cats are jerks. We’d use stronger language than that, but either way it became a significant impediment to making progress with an RFID-based s…

GitHub - lozaning/HomeAssistantPoliceDetector: Scans for BLE devices and if it see any from Taser International sets an home assistant switch to 'on', turns back off a minute after the device is gone

Scans for BLE devices and if it see any from Taser International sets an home assistant switch to 'on', turns back off a minute after the device is gone - GitHub - lozaning/HomeAssistantPol...

JFET Stands In For Triode In This Infinite Impedance Detector

An “Infinite Impedance Detector” might sound a little like something that [Zaphod Beeblebrox] would use to zip around the galaxy. It’s not, of course, but it is an interesting and…

Multiband Crystal Radio Set Pulls Out All The Stops

Most crystal radio receivers have a decidedly “field expedient” look to them. Fashioned as they often are from a few turns of wire around an oatmeal container and a safety pin scratchin…