In place of a balance wheel which oscillated at maybe 5 or 6 beats per second, these units used a quartz-crystal resonator which vibrated at 8,192 Hz, pushed by a battery-powered oscillator circuit. Most quartz-watch oscillators now operate at 32,768 Hz, though quartz actions have been designed[by whom? Since the 1980s, extra quartz watches than mechanical ones have been marketed.
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