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Eco-Drive watches use a battery recharged by a solar panel hidden under the watch face. In the rare and discontinued Eco-Drive Duo series, the solar power was supplemented by an automatic quartz power source. One early model, called the Citizen Vitality, used the watch hands to drive a small electric generator, but was discontinued following ...
The article starts: Eco-Drive is the brand of solar-powered wristwatches. . . . I think an article on (Citizen-nonspecific) solar-powered wristwatches might be more helpful. (This could of course have a section specific to Citizen's "Eco-Drive", if Citizen got there first, does it better than its rivals, or is otherwise particularly notable.)
Citizen Eco-Drive Thermo watches were introduced in 1999 and use the temperature difference between the wearer's arm and the surrounding environment as a power source. The rare Eco-Drive Thermo watches use the Seebeck effect to generate thermo electricity that powers the electronic movement and charges the secondary power cell. In the sun or in ...
It is also possible for quartz clocks and watches to have their quartz crystal oscillate at a higher frequency than 32 768 (= 2 15) Hz (high frequency quartz movements [4]) and/or generate digital pulses more than once per second, to drive a stepping motor powered second hand at a higher power of 2 than once every second, [5] but the electric ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 January 2025. Type of clock A traditional wind-up (key-wound), mechanical spring-powered alarm clock An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or ...
Such clocks from that early time period include the Small World Dual Bell Ringers and the Small World Performing Musicians, [3] which all utilized simple square waves for sound synthesis. By the early 90s, new models used FM synthesis , and a few models were revamped with FM synthesis, with at least some using Yamaha ICs.