Digital clock is a timing device that displays "hour", "minute" and "second" in human visual organs. Its timing period is 12 hours and the display full scale is 11:59:59. A basic digital clock circuit is mainly composed of a second signal generator, "hour, minute, second," counter, decoder and display. Compared with the traditional mechanical watch, it has the characteristics of accurate travel time, intuitive display and no mechanical transmission device.<br>This design is mainly based on the basic theory of digital circuit and low-frequency electronic circuit. It is designed with LM555, CD4060, 74ls161 and ls248 integrated devices. The circuit is designed by module design, sub module installation, debugging and other methods. The devices selected are mainly small and medium-sized integrated chips. Because the product is composed of multiple 74LS series integrated chips and the production cost is low, the design of the product is easy to realize and does not waste too much cost.<br>After analyzing the whole module and drawing the overall circuit diagram, simulate each module with Multisim and record the simulation results.<br>Key words: electronic clock, counting, Multisim<br>
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