Products > Test Equipment

LaPOD: Low cost Logic Analyzer probe for MSO5k, DHO900 and more!

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oliv3r:

--- Quote from: ebastler on October 26, 2023, 12:18:18 pm ---I'm sure I have overlooked it somewhere in the thread, but could you please (re-)state the specifications of the LM7322 and LM7324 versions? Do they have configurable thresholds (in which range)? What's the range of input voltages and what is the speed? Thanks!

--- End quote ---

I have no idea, I just took other people's design :D, or rather, the LM7322 is the same chip used in the offical probe, which was reverse engineered. The LM7324 is a quad driver, hoped to be cheaper ...

ebastler:
Could you point to those designs you used as a starting point? I had come across a thread once which aimed to do a full-spec replica of the Rigol probe, but it is not this thread here, right?

Also, could you restate the comparator part numbers please? Are they LMH732x?

UK:
Hey folks, just finished a shell for oliv3r's pods in Rigol's triangle style. The shell should print vertically as two halves without any supports. And as you can see it has a small oblong cutout and a light channel under it to make the LED shine in the center. It also has a flat lowering in the bottom for the label with channel numbers, which should prevent its easy pealing.

Hope you like it!

When oliv3r finalizes all PCB dimensions I'll do final refinements and upload STLs.

ebastler:
Nice! Looks very "Darth Vader" to me, matching the MSO5000.  ;)

oliv3r:

--- Quote from: UK on October 15, 2023, 09:54:44 pm ---By the way, how is it going with pin swapping to make all channels in order?

--- End quote ---


--- Quote from: oliv3r on October 16, 2023, 02:11:50 pm ---for now 'not happening' :p

--- End quote ---

So it happened. I took some measurements and realized my current design was super small. Which is great, and would have fit, but I was under the impression, the traces aren't length matched within the unit, might as well just fix the ordering with different length traces. But turns out, it is probably length matched within the scope (lets just hope they didn't take the mismatch of the bods into account).

Anyway, with the new measurements in hand, looking at the probe design, I figured, I'm so zoomed in, I can easly spare 3 - 5 mm. Also, I've learned how to do _proper_ differential track length matching in kicad (did it manually per track before, which was of course not good), figuring that would save me quite some space too. It did, but also using the 4 layers gave me plenty of beef to work with. So without further ado, correctly ordered breakout.

Also attached is a screenshot of what it looks like on the various layers.

Next steps, adding kicad automation to generate all the outputs from the pipeline, addinga pipeline, putting it all in git and pushing it to gitlab.

Also, some silkscreen fixups, attributions etc are deff. also in order. I really should fork this to its own topic too ...

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