| Although the timer was designed specifically for use with an ultra-violet-light box, it may, if course, be used for other purposes as we...
All items tagged with light and Current (3)
| The article describes a remote control (send/receive) system that does not use infra-red light, but visible light. It is particularly...
| Modern central heating boilers have no pilot light but electronic ignition. Checking whether ignition has taken place can be carried out...