(this curriculum project is the pulse digital circuit's simple application, designed the basketball to compete 30 second timer. This timer function is complete, may the direct clear, the start, the suspension and continuously as well as has the electro-optic warning function, simultaneously has applied the nixietube tell time. This timer had the start, the suspension and the continual function, may realize the break point time function conveniently, when the timer decreases progressively the zero hour, will send out the electro-optic alarm. This design completes the midway time function, has realized, in many specific situations carry on time tracing the function also to have the widespread application value in the social life. this timer's design uses the modular structure, is mainly composed of following 3, namely time module, control module, as well as decoding display module. When designs this timer, uses modular the design concept, causes to design is simpler, conveniently, quickly. This electric circuit is a clock production, triggering, the countdown counting, the decoding demonstration is the major function, in this structure foundation, structure main body electric circuit and auxiliary circuit two parts.
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