简易长途电话锁

• 作 者: 陈友林
• 出 处: 现代通信
• 发表日期: 1995年01期
• 关键词: 锁具 机械开关 电子开关 工作原理 林本 挂机状态 元件选择 摘机 原机 印刷电路板

简易长途电话锁陈友林本文介绍一种成本低、安装简便的长途电话锁，该锁具有锁定长途拨号不影响原机功能、耗电省、兼容性好等特点。一、电路组成图中，虚线右侧为所加电路，虚线左侧的ＩＣ和成盘是电话机内的局部电路。二、工作原理我们都知道，打长途，先拨“０”。如果...

Simple long-distance telephone lock Chen Youlin This text introduces a kind of long-distance telephone lock that is low in cost, easy to install, this lock has long-distance dialing of lock and does not influence the original machine function, power consumption province, compatibility is good and so on. First, the circuit diagram, the dotted line to the right of the added circuit, the dotted line to the left of the IC and into the phone is a local circuit within the phone. Second, the working principle We all know, make long-distance, first dial “0”. in case...