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Seconds Reference with Quartz Crystal

Simple analogue quartz watches or watch movements, which can be obtained inexpensively by mail order or at flea markets, contain a circuit that drives the watch motor with pulses at the rate of one per second. If you build such a watch movement into a small circuit, you have an inexpensive but nevertheless accurate 1-second frequency standard.
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Extra info / Update
The RC time defined for IC2 needs to be increased by a factor of 10. This requires changing P1 to 1 MOhm and R7 to 330 kOhm.
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