More about light (490)

1-07-2000 | RadiationThere are three types of radiation: firstly the visible variety, secondly the invisible kind and finally actinic radiation. Infra-r...

1-07-2000 | This is a short-range light barrier for use as an intruder alarm in doorposts, etc. The 555 in the transmitter (Figure 1) oscillates at abou...

1-12-1999 | The Christmas star described in this article is a far cry from the shoddy and unadventurous gadgets that light and flash around us at...

1-12-1999 | This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingdom...

1-12-1999 | The switch controls two relays, one, Re1, for turning the toilet light on and off, and the other, Re2, for turning an extractor fan on an...

1-09-1999 | It is unlikely that Nikola Tesla, born in 1856, could have foreseen the widespread interest in his inventions, more than one hundred year...

1-05-1999 | It is not widely known that a new type of lamp was introduced in the 1980s: the induction lamp. The design of this lamp, which has no...

1-04-1999 | A compact and programmable little robot vehicle may be built from ingredients like the famous BASIC Stamp, assorted electronic parts,...

1-04-1999 | The datasheet given here is for the IS471F OPIC™ Light Detector with Built-in Signal Processing Circuit for Light Modulation System.

1-03-1999 | In this article we discuss and respons the questions and advices of our readers.