The Fourth Circuit handed down a significant ruling today in United States v. Kolsuz on how the Fourth Amendment applies to cell phone searches of cell phones seized at the border. Although the court ...

A reasonable jury could determine that an employer was looking for an excuse to fire an employee when it searched his text messages, the 3rd U.S. Circuit Court of Appeals held Sept. 15. A federal ...

This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few ...

This article provides a simple circuit to detect the presence of an activated mobile by detecting the signals in the frequency range of 0.9 to 3 GHz. The most common electronic equipment used is cell ...

Alarm system designs often require circuitry that can detect whether a phone line is active or broken. With this type of design, the primary difficulty is drawing less than 5 µA from the phone line ...

If you thought that the digital TV transition, with its billion-dollar coupon program for converter boxes, was a migration nightmare, wait until it's time for the phone system to dump its legacy ...

[foamyguy] loves Python and messing around with electronics. Boards such as Adafruit’s Circuit Playground Express make it easy for him to take both anywhere. He recently found himself wanting to ...