4_digit_7_function_stopwatch_timer

Published:2009/7/21 23:27:00 Author:Jessie | From:SeekIC

4-digit 7-function stopwatch/timer. See table for switch abbreviations. See parts list for component part numbers and values. This circuit is based on the MM5865 universal timer IC. As drawn the display resolution is 1 second. A SPST switch can be included between pin 16 of IC2 and Vss to provide a resolution of 0.01 second and 1 second. Another option is the display control switch which may be used to inhibit the display (courtesy National Semiconductor Corporation).



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