Here is a logic probe made out of some basic parts: A hex inverter, some resistors, transistors, and a paper clip that is acting as a probe. This instructable contains the PCB art so you can etch your own.

Step 1: Diagram & Schematic

Below is a PCB layout explanation and a schematic.  A drop down resistor was included for the first input of the hex inverter to prevent it from hanging states whilst not in use.

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