More about light (490)

1-07-1987 | by J Donhauser This rear light for bicycles is fed from a battery charged with current from the dynamo, and starts to flash when the cyclist...

1-07-1987 | From an idea by R de Haan This circuit activates a relay upon detecting the absence of light on an LDR (light depen- dent resistor). It is p...

1-07-1987 | This application of the well- known Type 555 timer is in- tended for model railway en- thusiasts wishing to construct a two-lamp flashing be...

1-07-1987 | This circuit provides a com- puter with information about the presence of daylight. Poss- ible applications include auto- matically measurin...

1-11-1986 | EE 48 November 1986 ACTUATION SYSTEMS FOR FLIGHT CONTROL The need to transmit con- trol of an aircraft from the pilot"s hands to the flight...

1-07-1986 | EE July/August 1986 34 We all sometimes wish that some of the switches around the home were just a little easier to locate and operate, nota...

1-07-1986 | Just like the associated hand-held transmitter (see previous article), the receiver is simple to construct. As can be seen from the circuit...

1-07-1986 | 21 1 car lights monitor L3 = 20turns M van Oosten Ll = 1 Burns L2 = 1 Burns Many traffic accidents are caused by failing car lights. Often,...

1-07-1986 | by H Huynen light-sensitive switch A = on B = auto C = oft R1 R2 R6 T1 U C4 DI TIL81 BP103 1N4148 O 4704 e 25V B80C1500 T3 oA B C EZE T2 BC5...

1-07-1986 | 139 Unfortunately, we are all well aware that the annual holiday season is an anxious time for many people, since they worry about leaving t...