SimpleTronic | Accurate 1 Hz from AC mains @simpletronic1299 | Uploaded May 2018 | Updated October 2024, 2 hours ago.
How to extract an accurate 1Hz square wave from the AC mains. Line frequency is, depending on the country 50Hz or 60Hz. Frequency has small fluctuations in the short term, but is compensated daily by the power station resulting in a quite accurate frequency source for many timing applications.

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