As you can see in the photo up above, the detector has slits around its case (1), which lead to the main detection chamber. An invisible, infrared light beam, similar to the ones that Tom Cruise dodged, shoots into the chamber from a light-emitting diode (LED) (2). The same ...
The light is produced by a light-emitting diode (LED); right next to it, there's a photoelectric cell—a component that detects the reflected LED light and turns it back into an electrical signal. As you move your mouse around, the pattern of red light reflected off the desk changes ...
42×32 @ 517,14 A normal diode. 73×74 @ 615,55 A chip. The normal timer is a "555". "666" would be the number of the beast in Rev. 13:18. The pin connected to "?" is the CTRL pin on a normal 555 timer, which would typically be connected to ground (via a decoupling ...
What makes consumers choose certain products over others? A new study in theJournal of Consumer Researchhelps explain why consumers change their minds or switch their loyalties. "Recently, more and more experiments have shown that consumers' product evaluations and choices can be extremely unstable,"...
A UJT can be seen as equivalent of a diode connected to the junction of two resistors. The resistors are the internal resistances of the two bases. The supply voltage is normally applied across the two base terminals and the input voltage is applied to the emitter terminal and the base1. ...
So it's good for your pocket and kind to the Earth as well. There are two quite different kinds: CFLs (compact fluorescent lamps) and LED (light-emitting-diode) lamps. What's the difference between them, how do they work, and which is best? Let's take a closer look!
Typically, AC-powered chargers use some combination of step-down transformers (to convert high voltages, typically 110–240 volts, to lower ones more like 1.5–20 volts); rectifiers (diode-type circuits) and thyristors (silicon controlled rectifiers), to convert AC to DC; and integrated ...