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随着我国电讯事业的发展,电话机已成为人们主要的通讯工具。给电话机增设拨号显示功能,既新颖、直观、方便,又有效地防止了用户按错电话号码。本文介绍加装电话拨号显示器的3种方案。在加装显示器时都不必改动电话机的内部结构,安装方便,适用范围广。一、采用单只数码管显示号码(仿HD-9型电子电话机) 用1只数码管依次显示所报号码,其特点是整个电路与电话机串接在电话线上,线路简单,不需要外设电源,成本极低。为了便于制作,这里采用集寄存、译码、驱动、显示为一体
With the development of China’s telecommunications industry, telephones have become the main means of communication. Add a dial-up display to the phone, both new, intuitive, convenient, and effectively prevent users from pressing the wrong phone number. This article describes the installation of three types of dial-up telephone programs. Do not have to change the internal structure of the phone when installing the monitor, easy installation, wide range of applications. First, the use of a single digital display number (imitation HD-9-type electronic telephone) with a digital tube followed by the reported number, which is characterized by the entire circuit and telephone series connected to the telephone line, the line is simple, do not need Peripheral power supply, low cost. In order to facilitate the production, here used to register, decode, drive, display as one