All items tagged with LED and light (96)

1-06-2002 | White light LEDs have been a long time in the making. This design (as part of our Mini Project series) employs a simple circuit to make the...

1-01-2001 | This easy to construct light dimmer is controlled by a PIC controller and can handle a maximum current of 6 A. Three pushbuttons ensure extr...

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

1-12-1998 | Over the years this magazine has published a variety of light dimmers. Invariably, these were designs based on discrete components. Th...

1-12-1998 | This circuit shows that only a handful of parts is needed to make a light-controlled switch with a digital power buffer output capable o...

1-12-1998 | The consumer unit (or ‘electricity meter’) cupboard in some older houses is a badly lit place. If the bell transformer is also located i...

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

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...

1-12-1997 | The microcontroller-driven light barrier operates with two infra-red senders which, if set up correctly provide a measure of directivity.