当一负反馈连接运放过载期间,正反相输入端间电压差会突然增加。在正常情况,负反馈连接运放正反相输入端间电压差很小,它等于输出电压除增益。但在过载期间,这种反馈电压并不与输入匹配,会在运放输入端产生很大的电压差。本文介绍的电路就是用以监视放大器的输入电压差,并通过两个LED指示过载电压差 When a negative feedback is connected to the op amp overload, the voltage difference between the positive and negative input terminals suddenly increases. Under normal circumstances, negative feedback connected to the op amp positive and negative input voltage difference between very small, it is equal to the output voltage in addition to gain. However, during overload conditions, this feedback voltage does not match the input and produces a large voltage difference at the op amp input. This article describes the circuit is used to monitor the amplifier’s input voltage difference, and through two LED indicates the overload voltage difference