Electronics Projects, Simple Logic Probe Circuit with LED Indicator Level Measurement CD4001 article
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Simple Logic Probe Logic level measurement for cd4001 (cmos nor) designed with a simple measuring circuit 6v works with two 3v cr2032 (pc motherboard bios is known as battery) on top of each other and can be used with serial connection such as you see in the picture below if you use a wide heat shrinkable tubing is not wrong with you or even boxing smd materials are moved to the back with a critical piece of the pcb is designed to easily destroy all materials can be found.
Logic Probe Project
Simple Logic Probe Circuit schematic pcb files alternative link: simple-logic-probe-circuit-with-led-indicator-level-measurement-cd4001.rar alternative link2