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 narrow pulses to two outputs, across which a high-resistance solenoid is wired. This solenoid pushes the hands around via ...
Read full article: Cheap accurate 1Hz reference
from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/cheap-accurate-1hz-reference-2017-05/
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