本文介绍一种能精确测量电感值的简单电路。该装置以两个555定时器为基本电路,并利用了两个数字显示电路,如图1所示。第一个555定时器以单稳模式工作,它产生一个持续时间与待测的电感Lx的值成正比的脉冲。这种脉冲能触发两个计数器,对来自第二个555定时器的计时脉冲进行计数。第二个555定时器以非稳态模式工作。为了触发单稳态,运用了两个“与非”门电路和一个按钮开关。这种装置能提供一个单稳态负启动窄脉冲。 This article describes a simple circuit that measures the inductance accurately. The device uses two 555 timers as its basic circuitry and utilizes two digital display circuits, as shown in Figure 1. The first 555 timer, operating in monostable mode, generates a pulse whose duration is proportional to the value of the inductor Lx to be measured. This pulse triggers two counters to count the timing pulse from the second 555 timer. The second 555 timer operates in astable mode. To trigger monostable, two NAND gates and one push button switch are used. This device can provide a monostable negative start narrow pulse.