ELECTRONICS_NOW

Published:2009/6/18 2:59:00 Author:May | From:SeekIC

This timer circuit uses a 555IC timer and three 74LS193 counters to drive an LED display. S1 is activated by one person, who tums on piezo buzzer BZ1 via Q1 and also starts the clock; S1 is acti-vated by the other person being timed. This shuts off the timer, and the number of LEDs lit indicate, in binary form, the elapsed time.



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