the digital stopwatch circuit

Published:2011/6/6 12:04:00 Author:qqtang | Keyword: digital stopwatch | From:SeekIC

In the figure is the digital stop watch circuit. 5G5544(IC1) in the figure is a quartz integrated circuit, and it works as the second generator. 5G5544 outputs a pulse that the period is 2s by the 3-pin and the 5-pin, VD3,VD4 and VT1 consist a LEV converting circuit, and the second signal output is got. CD4518(IC2) contains two same decimal calculators, so binary counting can be formed, if more bit counting is needed, multi-connection can be done. CD4511(IC3、1C4) is the BCD-7 decoding/drive integrated circuit.



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