| For more than a hundred years ‘artificial light’ has almost exclusively meant incandescent lamps. However, the relatively low output of inca...
All items tagged with LED and Magnetic (7)
| It’s standard practice to use Pulse Width Modulated (PWM) signals to control electrical energy delivered to a load. Special precautions are...
| Using only permanent magnets and a light source Japanese scientists have succeeded in controlling the motion of a magnetically levitating gr...
| Physicists at the University of Utah (USA) have invented a new ‘spintronic’ organic light-emitting diode (OLED) with the potential to be bri...
| This highly educational gadget is a gyroscope that shows a text on a string of LEDs when you spin it, with the earth's magnetic field us...
| If you fit a line of LEDs on a circular PCB and power them on continuously, they generate rings of light when the board is spun. If you add...
| In 1888, the American researcher Oberlin Smith (1859–1934) published his thoughts on magnetic recording, which in 1898 led Valdemar Poulse...