More about light (490)

1-07-2006 | With two light barriers closely positioned one after the other it is possible to establish in which direction they have been crossed. If, fo...

1-07-2006 | During the Christmas holidays, you lose count of the number of homes lit up like Christmas trees, like fireflies by the thousands which twin...

1-07-2006 | Märklin’s light signal Type 74391 (blocking signal) for size HO model railway sets is fairly new and, at 10 euros (£7•00), reasonably afford...

1-07-2006 | It’s good fun to keep an eye on all sorts of things in your environment and on the basis of events in this environment to switch, for exampl...

1-07-2006 | Most digital multimeters have a sensitivity of 200 mV and in input impedance of 10 MOhm. With this information you can calculate that at ful...

1-05-2006 | Commercial PCB exposure light boxes usually employ gas discharge tubes as an ultraviolet (UV) light source, these devices are however bulky,...

1-02-2006 | This ultra-simple circuit will produce the familiar sound of sirens used by US police cars on emergency calls. A small lamp will also flash...

1-01-2006 | This design for a Christmas tree lighting system employs ten red light emitting diodes (LEDs) instead of the usual lamps. The LEDs are power...

1-12-2005 | The dark days of winter are on their way again, so it’s time for some cheerful lighting for the Festive Season. The author picked up six Chr...

1-10-2005 | Remote controlled light switches are becoming more and more common. DIY stores have inexpensive sets consisting of several light switches an...