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随着人们的物质生活水平的提高,通信事业的蓬勃发展,新的家用电器——电话正悄悄地进入了百姓家中。市场上的电话机也是种类繁多,功能各异。如脉冲、音频兼容、免提、存储、锁“零”等,但大部分电话机都没有锁“零”功能(限制打国内、国际长途电话功能),本人通过实验现向大家介绍两种锁“零”实验电路,供爱好者自行制作、安装。工作原理及电路图利用双D触发器CD4013和六反相器CD4069来完成锁零。双D触发器(见图1)的特点是当CD4013
With the improvement of people’s material living standards and the rapid development of communications, the new home appliance-telephone is quietly entering the homes of the people. The phone on the market is also a wide range of different functions. Such as pulse, audio compatibility, hands-free, storage, lock “zero”, etc., but most of the phones are not locked “zero” function (domestic and international long distance call restrictions), I introduce to you through experiments two locks “Zero” experimental circuit for enthusiasts to produce, install. Working principle and circuit diagram using double D flip-flop CD4013 and six inverter CD4069 to complete the zero lock. The double D flip-flop (see Figure 1) is characterized by the CD4013