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

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ebastler:

--- Quote from: oliv3r on November 06, 2023, 07:47:35 pm ---So it would end up something (a little prettier) like this, length matching should be duable, I just don't like the fact that I have to use really thing traces now (0.25mm), because much more won't fit between those pins of course ...

--- End quote ---

That should work. You can make the traces nearly twice as thick as they currently are and still keep the minimum distance from the pins, it seems.

And you should not need much extra room for length matching in that area: Channels 0 and 3 have extra wiggles above the voltage dividers anyway; if you straighten those, the lengths should be reasonably well-matched already?

UK:

--- Quote from: oliv3r on November 06, 2023, 07:47:35 pm ---I wanted to keep the PCB length <5cm because that's where you get the cheaper rates with the board houses, or you can put 2 on a 10x10 board :)

--- End quote ---
I don't understand why you even need this since previously you told us you won't mass produce them... currently, every PCB manufacturing service offers a minimum 5pcs of PCB which is 4 pods + 1 extra... what a point to place 3 pcs on 1 PCB if you do not plan to get in total 15 pods |O


--- Quote from: ebastler on November 06, 2023, 08:23:05 pm ---You can make the traces nearly twice as thick as they currently are and still keep the minimum distance from the pins, it seems.

--- End quote ---
Totally agree!
You can route them like this to get nearly perfect length matching.

Edit: really forgot we have here 4 layer PCB  ;)

mwb1100:
A little bit of an interjection:  I'm really a software guy so pretty much everything here is over my head, but I have been loving following this thread.  Seeing the issues involved in designing a layout AND seeing the amazing collaboration going on here is just fantastic!

oliv3r:
So while fiddling with it, it wasn't actually that hard :) and not even that ugly. I've put the traces all in the middle, so that a) ground planes help, and b) I did really need that room.


--- Quote from: UK on November 06, 2023, 09:00:53 pm ---
--- Quote from: oliv3r on November 06, 2023, 07:47:35 pm ---I wanted to keep the PCB length <5cm because that's where you get the cheaper rates with the board houses, or you can put 2 on a 10x10 board :)

--- End quote ---
I don't understand why you even need this since previously you told us you won't mass produce them... currently, every PCB manufacturing service offers a minimum 5pcs of PCB which is 4 pods + 1 extra... what a point to place 3 pcs on 1 PCB if you do not plan to get in total 15 pods |O

--- End quote ---
Well I also want some spare/give away's :p and .. options/premature optimization :p My OCD also won't cope going just a few mm over 5cm board size :D

As for mass-producing, if there's tons of people wanting these boards, I might order a bigger quantity of course, but I won't be going into business selling these, that's true.


--- Quote from: UK on November 06, 2023, 09:00:53 pm ---
--- Quote from: ebastler on November 06, 2023, 08:23:05 pm ---You can make the traces nearly twice as thick as they currently are and still keep the minimum distance from the pins, it seems.

--- End quote ---
Totally agree!
You can route them like this to get nearly perfect length matching.

--- End quote ---
Yep, I played with it a bit, and got to 0.4mm which isn't too horrible I thought.

The wiggles above the voltage dividers are needed, because the center two channels come from the top of the chip, so need to go all the way from the top, to the bottom.


--- Quote from: mwb1100 on November 06, 2023, 09:32:07 pm ---A little bit of an interjection:  I'm really a software guy so pretty much everything here is over my head, but I have been loving following this thread.  Seeing the issues involved in designing a layout AND seeing the amazing collaboration going on here is just fantastic!

--- End quote ---

Same here, I couldn't properly design this, I don't know enough about EE, but we got the reverse engineered pods and earlier designs, that I'm hopping will prove to be true :p

It's mostly just me taking other peoples great idea's and re-spinning them, listening to ebastler and UK for feedback/wishes :)

P.S. I asked the admin/moderate to spin this thread into its own forum post, so lets see if that'll happen :)

ebastler:

--- Quote from: oliv3r on November 06, 2023, 09:46:52 pm ---The wiggles above the voltage dividers are needed, because the center two channels come from the top of the chip, so need to go all the way from the top, to the bottom.

--- End quote ---

No, I don't think they are needed. They are in channels 0 and 3, right? And now you have created additional wiggles in channels 1 and 2 just above the 2*4 plug. They pretty much even out, so just do away with all four of them -- that's what I meant.

Otherwise, great work, and I am excited to see the pod getting its final touches!  :-+

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