| Physicians and repair engineers often use small light pens for visual examination purposes. Rugged and expensive as these pens may be, their...
More about LED (745)
| In this issue we publish an ActiveX component, which can be used to control the USB analogue converter (Elektor Electronics, November 2003)....
| There are many applications where the accuracy of a digital or analogue (bar graph) is not required but something better than a simple low/h...
| Light-sensitive sensors with characteristics similar to those of the human eye are most often implemented using photoresistors or special (a...
| This circuit will need just a few micro-amps to make an LED flash. The energy comes from a home made ‘vegetarian’ battery.We have to admit t...
| If you do not want your expensive R/C model to crash or disappear forever when the radio link fails or is subject to heavy interference, you...
| You don’t need special ICs when a capacitive (or ‘touch’) switch can also be realised with an inexpensive PIC controller. This article shows...
| The wide availability of low-cost switched mains sockets with radio remote control provides a simple way to control electrical equipment, li...
| Although this month’s Mini Project is not exactly stunning from a technical point of view, there are a number of unusual sides to it, mainly...
| LEDs have been around for years now but it’s only recently that things have started to get interesting with white and superbright versions a...