在工业控制中,人们经常需要知道某一时刻被加热物体的实际温度值,但有时也同样需要知道,该时刻被加热物体是处于升温、降温或是恒温状态。这里介绍的电路,只需要在原有数字温度显示电路的基础上增加三块CMOS片,便可具备此项功能(右图)。这个电路的核心器件是两输入端的4位数字比较器IC2,其中A输入端的4位数字来 In industrial control, people often need to know the actual temperature value of a heated object at a certain moment. However, it is also sometimes needed to know that the heated object is in a state of heating, cooling or constant temperature at this moment. The circuit described here, only need to add three pieces of CMOS film on the basis of the original digital temperature display circuit, can have this function (right). The core of this circuit is a two-input 4-bit digital comparator IC2, which A input 4-bit digital