This design is based on the 89C51 single-chip computer, DS12887A clock chip, DAC0809 analog-to-digital conversion chip, and is supplemented by necessary circuits to form a multifunctional digital clock. It is powered by a 220V, 50Hz AC power supply and can accurately display time, adjust time, and set alarms. It can also display the ambient temperature of the clock, the grid voltage and grid frequency during operation, and has undervoltage and overvoltage alarms and non-contact alarm stop functions.
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