论文部分内容阅读
数字电路中,有三种逻辑状态:“1(高电平)”、“0(低电平)”和“悬空(高阻态)”。逻辑笔可以通过发光二极管或数码管显示出被测点的逻辑状态。以下介绍两款容易制作的逻辑笔,为使广大电子爱好者在对数字电路测试时,能非常方便和直观测出上述三种逻辑状态。下面介绍两款逻辑笔的制作原理,供参考。一、用发光二极管显示的逻辑笔该电路由6个非门和2只发光二极管组成,如图1所示。它可以检测高、低电平,当输入为高电平时,红色发光二极管亮,当输入为低电平时,绿色发光二极管亮。
There are three logic states in the digital circuit: “1 (high)”, “0 (low)” and “dangling (high impedance)”. The logic pen can reveal the logical state of the measured point through the light-emitting diode or digital tube. The following is a brief introduction of two easy to make logic pens, so that the majority of electronic enthusiasts in the digital circuit test, can be very convenient and intuitive measurement of the above three logic states. The following describes the production of two logic pens principle for reference. First, the use of light-emitting diode logic pen The circuit consists of six non-door and two light-emitting diodes, as shown in Figure 1. It can detect high, low, when the input is high, the red light-emitting diode, when the input is low, the green light-emitting diode.