If you’re looking for a 1-second time reference, you’d probably just grab a GPS module off the shelf and use the 1PPS output. As demonstrated by [InazumaDenki], though, an old quartz clock module can ...
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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