Simple Logic Probe Circuit with LED Indicator Level Measurement CD4001

A simple measurement circuit designed with CD4001 (cmos nor) for logic level measurement works with 6 volts. Two 3 volt cr2032 (known as motherboard bios battery) can be placed on top of each other and used with serial connection. you will not have any problems, even if the pcb is designed again with smd materials, it can be easily moved, there is no critical part, all materials can be found…

Logic Probe Project

What is a Logic Probe?

Various circuit projects have been shared about the Logic probe on many websites. Logic probe circuits Apart from the High-high and Low-low type logic display, you can also see open circuit status and pulsed signals. You can see pulsed signals up to the upper limit of the cmos IC.

The 3 functions mentioned above can be followed with the logic probe circuit made with the CD4001 IC. Circuit elements are few and you can run the circuit with a small 6v battery.

Source: http://www.siliconchip.com.au/cms/A_102204/article.html

Simple Logic Probe Circuit schematic pcb files alternative link: