More about light (490)

1-07-1991 | This electronic switch is designed to be connected direct to the mains, which obviates a low-voltage supply and so keeps the cost and sp...

1-07-1991 | To prevent the dynamo-driven lights of your bicyle going out when you stop in the dark for, say, traffic lights, the simple circuit here...

1-06-1991 | This month we present an experimental circuit to demonstrate that visible light can be modulated and used as a carrier to convey informati...

1-06-1991 | LIGHT SWITCH WITH TV REMOTE CONTROL Why not use the infra-red remote control, that magic little box supplied with every TV set these days, f...

1-04-1991 | Low-voltage halogen lights are becoming fashionable, which is not surprising when one considers the advantages of these small units. They...

1-12-1990 | The circuit presented here guarantees that if bulb La1 gives up the ghost. bulb La2 will take over its task, 50 that there is always ligh...

1-12-1990 | Although we assume that most of our readers are thoughtful drivers who do not switch on their rear fog lights when closely followed by ot...

1-09-1990 | This circuit automatically switches on the headlights of a ear after the engine is started. In countries like Sweden and Canada, ear driver...

1-07-1990 | Many X- Y plotters, particularly the DlY type, have, for all sorts of reason, no protection against incident light, so that the phototrans...

1-07-1990 | This simple bedside light is suitable for telling the time at night, findings one's way to the door, and so on.