This infrared gadget claims to improve your mood with lights - I got to the bottom of it

I tested a near-infrared light device that attaches to my computer, mimics the sun, and allegedly improves mood and focus. Did it work?

TCL’s German QLED ban puts pressure on TV brands to be more honest about QDs

Germany recently banned TCL from marketing some of its TVs as QLED (quantum dot light-emitting diode), with a Munich court ruling that the TVs lack the quantum dot (QD) structure and performance ...
Hackaday

Building An LC Meter With A Franklin Oscillator

Although it dates back to the early days of the Marconi Company in the 1920s, the Franklin oscillator has remained a ...
Circuit Digest

Build a Simple Optocoupler Tester Circuit for Fault Detection

Testing for failure with a multimeter is only partially effective, whereas a dedicated optocoupler testing circuit provides clear results in just seconds. For related tutorials and step-by-step build ...