74LS161 JK触发器带清0端,项目名称为dff_JK_111 十进制计数器74LS290,项目名定为CTLS290：运算方法编写的290计数器：另一种编法LS290 不带使能端的3线8线译码器 八选一数具选择器：用CASE语句 全加器： 简单的JK触发器-74LS161 JK flip-flop with cleared end Project Name dff_JK_111　decade counter 74LS290 project name as CTLS290: and computing method for the preparation of the 290 counter: Another compilation Act LS290 8 line decoder can end line without eight JK flip-flop election with a number of selector: full adder CASE statement: