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Triple-digit display electronic timer circuit composed of NE

2016-12-10 03:37  
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Triple-digit display electronic timer circuit composed of NE555 and CD40110
As shown in figure is electronic timing which is used for raider type cars. Car startups will launch timer,while car stops makes the timer stop.The value that car showsis the racing spending time. This circuit is composedof thecontrol switch and electronic timer. And electronic timerconsists of the time base generator and digital electronic counter. (A)is principle diagram; (b)is control switch circuit. IC1, IC2 and IC3are CD40110.