Logic Probe kit

Name: Logic Probe kit
SKU: 12055
Price: 5.00 USD
Availability: Discontinued
Rating: 4.62 (2 reviews)

(2 Reviews)

Test logic levels within an operating circuit.

Designed by ZombieWizard in Canada

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2018-04-29T20:50:45.685Z-Finished Probe in Case.JPG

2018-04-29T20:50:45.685Z-Probe board in case.JPG

Test logic levels within an operating circuit.

What is it? A logic probe lets you peek inside an operating digital circuit to see not voltage levels, but logic signals. Why did you make it? It's a must have tool when debugging digital circuits (t…

What is it?

A logic probe lets you peek inside an operating digital circuit to see not voltage levels, but logic signals.

Why did you make it?

It's a must have tool when debugging digital circuits (that includes anything that's using GPIO pins on Arduino and the like). I wanted one for myself, as well as having A DIY version available as part of an Adafruit learning guide series I was writing.

What makes it special?

It's simple, small, and inexpensive. It doesn't have a lot of bells and whistles but it does the job it was meant for. The probe, itself, is an analog circuit

The kit contains the bare PCB and the required parts. There is an option to include a case, but STL files are available so that you can print one instead. Fusion360 files are available so adjustments can be made (probably only to the tip length). The power leads are up to you, depending on how long you want them and what you want to connect them to for power.

Review Breakdown

Average Ratings

Product: (4.50)

Documentation: (4.50)

Shipping: (4.50)

Communication: (5.00)

Seon | July 7, 2018

A fun kit to assemble, and works like a champ!

The PCB was very clearly labeled and assembly was a breeze. The base was a tad tight, but I believe Dave has already updated his case design to make it easier to insert the electronics, and that just goes to show you the level of support and care you get when buying from Dave - top notch!

Thilo | May 28, 2018

A well made kit for beginners, a useful tool for hobbyists

I bought this kit because I wanted a nicely produced logic probe for use on old computers (C64, VIC20, Spectrum) and various oscilloscopes (e.g. Gould), that sit on my bench waiting for diagnosis and repair.
This kit comes with a sleek 3D-printed case that is easy and comfortable to handle. The board itself is rather small, but well engineered.

Building the kit can't be much easier. All components are labelled in the silkscreen, everything falls into place just from looking at it (and maybe reviewing resistor colour codes). The only uncertainty came from the LEDs, but this is helped by the build video linked in the description. Having a multimeter with resistor measurement and diode test is advised, though.
Only point of critique: the case is a little bit too tight around the board, requiring a little persuasion. You can't break too much, but beginners will probably hesitate.

As for the use, it is just a matter of hooking up the +5V and GND and starting to probe signals. Stable signals will be very easy to recognize; lines with changing states will make both LEDs light up. This is where more complicated probes make it a little bit easier: Some have dividers that reduce the frequency of the flashes, letting you watch the LEDs change their state. Nice, but not vital.

For the price this is both a very neat soldering practice and a useful tool that shouldn't be missed from any electronics bench or toolbox.