I'm building a simple 555 timer based logic probe from spare parts I had laying around.

Original schematics from ETI (November 1979): https://schematicsforfree.com/files/Radio%20%26%20Communications/Test%20Equipment/RF%20Monitor%20Meter.pdf

Updated version on Instructables: https://www.instructables.com/Build-Your-Own-Logic-Probe-on-the-Cheap-Using-a-55/

I used an ILC555 chip instead of an original NE555 and also replaced the 1N914 diodes with 1N4148s.

TIME STAMPS: 0:00 Introduction 1:31 The Circuit 7:00 Building the Circuit 16:25 Preparing the Enclosure 21:46 Connecting to the World 26:27 Testing the Probe 30:08 Final Assembly 31:31 Real World Testing 35:04 Thank you & Good night

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