You’ve doubtless seen those ubiquitous clock modules, especially when setting clocks for daylight savings time. You know the ones: a single AA battery, a wheel to set the time, and two or three hands ...
A showed me a clever thing, a 1Hz reference based on a quartz clock module. These are inside just about every ‘quartz clock’ and are powered by a single AA cell. Apparently, the pcb inside provides ...
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