This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off ...

This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. A Rotary Switch sets the timer according to six classified Photo-types ...

Logic and Line Diagrams provides a comprehensive look at circuit logic and diagrams. The way a circuit functions depends on its circuit logic, which can be AND, OR, NAND, or NOR. The logic used in a ...