在自动控制装置中,各种被控制的物理量一般都先转换成数字量,并通过数字量的接收、传递、运算等去控制各种生产机械和生产过程。为了掌握数字量的接收、传递和运算等知识,首先要了解如何通过各种电子开关元件来取得弱电信息,这在第一篇已介绍过了;其次,要学会如何用简便的办法作成弱电信号源,这就是本篇所要介绍的内容。本文介绍的弱电信号源,均由一集成块搭成,有的仅用一块集成 In the automatic control device, various kinds of controlled physical quantities are generally converted into digital quantities in the first place, and various manufacturing machines and manufacturing processes are controlled by the digital reception, transfer and calculation. In order to master digital knowledge of receiving, transmitting and computing, we must first understand how to get through a variety of electronic switching components to obtain weak information, which has been introduced in the first; Second, we must learn how to use simple methods to make weak signals Source, this is the content to be introduced in this chapter. This article describes the weak signal source, are made of an integrated block, and some only integrated with one