| In this article we discuss and respons the questions and advices of our readers.
All items tagged with LED and light (92)
| 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...
| The consumer unit (or ‘electricity meter’) cupboard in some older houses is a badly lit place. If the bell transformer is also located i...
| Over the years this magazine has published a variety of light dimmers. Invariably, these were designs based on discrete components. Th...
| One obvious, perfectly normal and socially accepted way of seeing if somebody is at home is to ring the doorbell. Unfortunately, burglar...
| To many hi-fi enthusiasts and musicians, the thermionic valve (electron tube), the sound of a valve amplifier cannot be bettered by that...
| A PIR (passive infrared) detector coupled with an electrtc light is now widely used rar intruder protection. PIR detectors are also avail...
| The microcontroller-driven light barrier operates with two infra-red senders which, if set up correctly provide a measure of directivity.
| Flexible tubelight units containing many vividly coloured lights are very popular ornaments these days, and they are seen in many shop...
| The article describes a remote control (send/receive) system that does not use infra-red light, but visible light. It is particularly...