Dec
11
2009
1

How well do solar powered watches work?

Solar powered watch showing the H/M/L battery gauge (photo by Roger Browne - CC-BY)The promise made by a solar powered digital watch is a big one—an end to the need to periodically replace the watch battery. And if the solar powered watch also has radio controlled timesetting then the watch should “just work”. It should always show the correct time and should never run down. But how well [more…]

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Oct
10
2009
2

How does a radio-controlled watch (or radio controlled clock) work?

Radio controlled watch (photo by RBerteig - CC-BY)In many countries of the world you can buy a clock or watch that will always show the correct time to the nearest second, and which never needs to be set. It will even automatically switch to daylight savings time when applicable. How is this possible? The timepiece includes a radio receiver tuned to a [more…]

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