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本文介绍一种简单的逻辑笔(亦称逻辑电平测试器)电路。这种逻辑笔电路(见图)可用来对遥控系统中数字信号电平的高低和脉冲信号的有无进行准确的检测。IC1使用四电压比较集成电路LM324中的两个比较器。将A1和A2同相输入端和反相输入端彼此相连,接成两组输入端。一组接R1和RP1组成的分压电路,作门限基准电压输入端。调节电位器RP1,可使门限电压在0V～4/5V_(DD)之间变化,以适应对
This article describes a simple logic pen (also known as logic level tester) circuit. This logic pen circuit (see picture) can be used to accurately detect the level of the digital signal and the presence or absence of the pulse signal in the remote control system. IC1 uses four comparators in the LM324 for four voltage comparison ICs. The A1 and A2 non-inverting input and inverting input connected to each other, then into two sets of inputs. A group of R1 and RP1 after the composition of the voltage divider circuit for threshold reference voltage input. Adjust the potentiometer RP1, the threshold voltage can be varied between 0V ~ 4 / 5V_ (DD), in order to adapt to