Making a simple 555 Based Logic Probe

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Jan Beta

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Published on January 2, 2025 6:35:46 PM ● Video Link: https://www.youtube.com/watch?v=NhgjBUmnA7k

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I'm building a simple 555 timer based logic probe from spare parts I had laying around. // Kindly sponsored by my favorite PCB manufacturer PCBWay! https://www.pcbway.com/

Original schematics from ETI (November 1979):
https://schematicsforfree.com/files/Radio & Communications/Test Equipment/RF Monitor Meter.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 Sponsor Message
7:36 Building the Circuit
17:01 Preparing the Enclosure
22:22 Connecting to the World
27:03 Testing the Probe
30:44 Final Assembly
32:07 Real World Testing
35:40 Thank you & Good night

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