More about light (490)

1-12-1993 | The delay circuit ensures that a car's intertor light remains on for about five seconds after all the doors have been closed. This enable...

1-12-1993 | This is one of the simplest twilight switches ever published in this magazine. When it gets dark, the value of light-sensitive resistor R...

1-12-1993 | This article describes a low-cost alternative to the normaily pretty expensive lamp used to light the photographie darkroom. It consists of...

1-07-1993 | The audio signal is applied to the indicator circuit via a 1:1-1:4 microphone transformer. Its level determines which of the two lamps. L,...

1-07-1993 | Many motorcycles have the facility that as soon as the igrutton is switched on, their dipped headlights (or day running lights) corne on....

1-07-1993 | In most telephone networks, a direct voltage of 48-60 V exists at terminals a and b. When the call signal comes in, a 50-60 V alternating...

1-07-1993 | Many cars are not fitted with fog lights and, what is more, there is often no provision for them. However, since in most European and Nor...

1-07-1993 | High-order filters are normally designed by using two or more 2nd order sections in series. This means that a 4th-order filter needs at l...

1-07-1993 | Halogen lamps are rightly popular because they give a good light and have an excellent efficiency. Unfortunately, they tend to be costly....

1-07-1993 | Most cars are provided nowadays with interior lighning that comes on automatically when one of the doors (or the tailgate of a hatchback)...