LEDs

http://www.edn.com/design/led/4442091/LED-current-regulator-has-low-dropout?utm_content=buffer1967d&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer This article has an intetesting LED current regulator circuit idea built using transistors. The voltage drop on the current sensing resistor r is less than 40mV.  The nominal LED current here is 7.2 mA at 9V. Increasing to 20V causes a current change of +15%, giving a dynamic resistance of about 10kΩ. →

I have earlier written on using DMX-512 controlled dimmer to control mains powered lamps. It works, but is expensive and traditional incandescent lamps are going out of fashion. LEDs are the future, so a cheap easy to use board for controlling low voltage LEDs with DMX-512 signal are needed. To experiment with LED conrolling I →

 The largest LED video display in all of sports article tells thatMercedes-Benz Stadium, the future home of the Atlanta Falcons and MLS expansion team Atlanta United FC, will feature the largest LED video display in sports. The 360-degree halo display will be part of the retractable roof.Engineered by Daktronics, the halo video board is 58 →

LED features single photon emission article tells that Graphene Flagship is hitting its research out of the proverbial park by demonstrating an all-electrical quantum LED with single-photon emission. The LEDs are atomically thin and have potential as on-chip photon sources that can be used in quantum information apps. Graphene Flagship researchers used layers that included transition →

http://www.edn.com/electronics-blogs/led-zone/4442814/People-not-immune-to-health-impact-of-LEDs–according-to-the-AMA?_mc=sm_edn&hootPostID=de10415dc860da5de122a6a05f70f7c3 High power led lights have health effects to us. →

http://www.engineersgarage.com/mygarage/making-diy-arduino-pumpkin DIY project idea for halloween. →

http://www.iflscience.com/health-and-medicine/american-medical-association-warns-of-health-and-safety-problems-from-white-led-streetlights/ Blue light from “cool white” color LEDs is considered to be problematic. Color should be “warm white” with temperature of 3000K or lower. →

RGB LEDs are awesome – especially the new, fancy ones with the WS2812 RGB LED driver. These LEDs can be individually controlled to display red, green, and blue, but interfacing them with a microcontroller or computer. To test controlling WS2812 RGB LEDs I bought a cheap addressable LED strip. An addressable RGB LED strip is →

https://m.youtube.com/watch?v=VU26qkZiyl8 Cool building size LED display showing computer demo graphics. Enjoy! Posted from WordPress for Android →

Due real Fluorescent lamp fire danger I have pretty much tried to get rid of potentially dangerous tradtional starters in the fuorescent lamps. So I replaced the starter with electronic safety model – if bulb does not start, it will stay off without heating. Or at least should. I got one Axxel S10 starter that →