More about magnet (157)

1-07-2001 | The circuit shows one way of obtaining a voltage of 90 V from a 1.5 V battery supply. The LT1073 switching regulator from Linear Technology...

1-07-2001 | Nowadays, there is a whole series of switching regulator ICs that work according to the step-up principle and thus convert the input voltage...

1-07-2001 | This secret lock, unlike a conventional code lock, gives away no hints to the unwanted visitor as to its existence: there are no buttons, sw...

1-07-2000 | There are various types of remote-control extenders. Many of them use an electrical or electromagnetic link to carry the signal from one roo...

1-07-2000 | The battery discharger published in the June 1998 issue of this magazine may be improved by adding a Schottky diode (D3). This ensures that...

1-06-2000 | Credit cards, Eurocheque cards, other types of bank cards and car park tickets: even if many of these cards contain chips, they all have mag...

1-12-1999 | In 1888, the American researcher Oberlin Smith (1859–1934) published his thoughts on magnetic recording, which in 1898 led Valdemar Poulse...

1-10-1999 | Towards the end of the 19th century several researchers were developing ways and means of converting sound into electrical signals. The fi...

1-07-1999 | One of the problems that designers of portable equipment face is generating a regulated voltage whose level lies between those of a fully...

1-05-1999 | It took the genius of Gauss, probably the greatest mathematician who ever lived, to see the proper importance of the discoveries of Oersted...