Products > Test Equipment

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

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oliv3r:

--- Quote from: UK on October 26, 2023, 06:29:28 pm ---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.

--- End quote ---

That looks friggin sexy as heck :D

can you also do one for the breakout board? Here's the dimensions I have for now, but since the boards aren't proven to be working (haven't built them yet) can't say that it won't change (but I have to doubt that ...)

The slot in the middle for the led looks ubernice :) should be doable with a light-guide, hotglue usually works great :p However, I'm not sure I can get the LED in the middle like that, see the dimensions I have for now. I could wiggle in the LED between the resistors and the connector, but probably will need to enbiggen the PCB a little ...

The breakout doesn't have mounting holes, shouldn't be an issue with proper dimensions I suppose, but there isnt' much room to add them either ...

ebastler:
A 17 mm pitch is definitely not going to work for the HDMI sockets. The slimmest HDMI plug I can find in my home is 20 mm wide.

I find it a bit frustrating that you post something and disappear again for days right away, not responding to any questions or concerns. Yes, you can use this forum as a one-way broadcastig channel, but you are losing the opportunity to improve your design, and may lose your audience. Personally I would rather roll my own PCB design, because it seems increasingly unlikely that you will listen to suggestions.

Edit: Strikethrough.  ;)

oliv3r:

--- Quote from: ebastler on October 28, 2023, 01:07:50 pm ---Congratulations on solving that puzzle -- nice job!

EDIT: Looking again at the layout, I think there is a bit more puzzling to be done. The orange traces in general don't look length-matched to me; the traces for IN9 in particular are much shorter than any of the other pairs?

--- End quote ---
You are right!! The orange ones are the longest traces, so figured those would be easiest and could be done last, but forgot ;) here's the traces lengthen :p


--- Quote from: ebastler on October 28, 2023, 01:07:50 pm ---On the silkscreen, and also when you create a new thread about this, I would not call it an "MSO5000" LA board. The new DHO900 series (low-cost 12 bit scopes) uses the exact same pinout for the LA probes, and will certainy get a lot of attention. So be sure to let those users know about your probe too!  ;)

--- End quote ---
I called it LA14 before, just cause ... but please, come up with some cool names :D


--- Quote from: ebastler on October 28, 2023, 01:07:50 pm ---LM7322 and LM7324 are the two used LM parts, the other one is the sn65lvds. My signature has all the rigol related links, but I think this thread included most info? I don't remember which one has the best data. ...

If you could take a moment to address my earlier question? Thanks!


--- Quote from: ebastler on October 26, 2023, 12:38:56 pm ---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?

--- End quote ---

--- End quote ---

ebastler:

--- Quote from: oliv3r on November 01, 2023, 05:18:34 pm ---I called it LA14 before, just cause ... but please, come up with some cool names :D

--- End quote ---
The Rigol logic analyser probe it replaces is the PLA2216. "PLA2216 replacement" would be clear but not cool... Maybe "PLA2216 plus" or such, because it is actually better than the original (from a handling perspective)?


--- Quote ---LM7322 and LM7324 are the two used LM parts

--- End quote ---
No, those are not the correct numbers, that's why I asked. LM7322 is a plain old op-amp; LM7324 does not exist at all. It's LMH732x. Should be fixed on the silkscreen of the probe PCBs!


--- Quote ---I think this thread included most info? I don't remember which one has the best data.

--- End quote ---
The present thread is the "low cost probe" one, which originally focused on the cheaper CMOS/TTL-level pods only. As mentioned a few posts above, I have found the other relevant thread in the meantime. It looks into using the original LMH732x comparators, and has a few schematics and layout suggestions for those: https://www.eevblog.com/forum/testgear/rpl1116-active-logic-probe-pod-for-1000z-series-teardown/.

UK:

--- Quote from: oliv3r on November 01, 2023, 04:42:48 pm ---can you also do one for the breakout board?

--- End quote ---
Sure, but it will definitely take some time with my current job.


--- Quote from: oliv3r on November 01, 2023, 04:42:48 pm ---That looks friggin sexy as heck :D

--- End quote ---
I'm glad you like it too. I've dived a bit deeper into the MSO5000 look and made several touches... now it definitely looks in its authentic style.

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