XDA Developers on MSN

I built a cheap music-controlled RGB LED strip with ESP32 and it's better than any store-bought one

Smaller budget. No app or cloud.
EDN

Mains Operated LED Circuit Schematic

Here is a simple and powerful LED circuit that can be operated directly from the AC 100 volt to AC 230 Volts mains supply. The circuit can be used as mains power locator or night lamp etc.. The ...
Ars Technica

Promise Ultra66 LED pinout?

does anyone knonw the voltage on the LED connector on the promise ata66 card?<P>i have an LED i want to attach (blue 3.7v from radio shack, or a 12V green if that won't work) but i don't want to blow ...
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 ...