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

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oliv3r:

--- Quote from: UK on October 21, 2023, 10:31:57 pm ---It looks sleek, but it would be great to add a small led on it.
When you have a mess on the table, especially when you use all four pods it will be nice to have some illumination as to what pods are connected to MSO.  ::)

--- End quote ---

Fair enough, I did add leds to the pod, to indicate which 'type' is connected (e.g. the LM7324 one will be blue, the LM7322 will be red + green). Having matching leds on the pod would be a nice idea, I'm a little worried with regards to power consumption.

oliv3r:
So the LM3222 was a lot easier to do, but (due to double the chips) is slightly larger. I've added an LED, though not sure how to make it visible later. I guess heatshrink instead of a case is certainly an option :)

Once I've done all the pods, I'll size them up to be all the same size with the mounting holes in the same location, and the led as well ;)

Here as before, big 2012 (metric) caps and resistors except for the differential resistors, everything should be length matched. Impedance matching is probably not the the case ...

oliv3r:
Finished the sn65lvds variant, which was the easiest and most pleasurable to route; also because it had the most space available :) It is basically Nikki's design, but with trace length matching, and using 4 channel pods of course.

Gonna use this as the size of the PCB and cleanup the previous editions next, making sure the LED is on the same spot etc ...

oliv3r:
Read back this thread, and saw discussion about the need, or lack thereof, matching the traces for delay's. I know the scope doesn't match traces either, if we look at the X-Ray ...

I never put the following pic on https://gitlab.com/riglol/rigolee/firmware/-/wikis/MSO5000%20teardown (cropped due to size restriction of the forum). I'll see if I can trace it out in kicad to determine an estimated trace length ...

but again, rigol doens't care either :)

Rigol does care, I just found a pretty good shot which shows the serpentines clearly (bastardized to jpeg cause of forum)

ebastler:
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!

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