More about light (490)

1-07-1998 | One obvious, perfectly normal and socially accepted way of seeing if somebody is at home is to ring the doorbell. Unfortunately, burglar...

1-07-1998 | Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and...

1-07-1998 | In many cases, the dimmer presented here may be built into a wall-mounted box containing the light switch. It is intended for use with 2...

1-07-1998 | To many hi-fi enthusiasts and musicians, the thermionic valve (electron tube), the sound of a valve amplifier cannot be bettered by that...

1-07-1998 | The circuit of the running light comprises two integrated circuits (ICs), a resistor, a capacitor and seven light-emitting diodes (LEDs)...

1-07-1998 | This article is of interest only to readers whose bicycle lights are powered by a dynamo. The laws on bicycle lights in the United Kingd...

1-05-1998 | When in 1870 John Tyndall, an Irish physicist working in the USA, showed that light can be guided, he could not have foreseen that li...

1-02-1998 | Before the computer age, it required quite a number of assistants to control the stage lighting in a theatre. Today, however, even here...

1-02-1998 | We have reason to believe that this is a unique and novel circuit. It measures ambient light intensity by means of the serial port on your...

1-12-1997 | A PIR (passive infrared) detector coupled with an electrtc light is now widely used rar intruder protection. PIR detectors are also avail...