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<d1b2>
<Attie> does anyone have a part number for J5? the schematic references Amphenol 20021321-00040T4LF as a suggested mating connector, and I've located 20021121-00044T4LF that appears to be suitable (the without pg version)
<d1b2>
<Attie> *s/pg/post/
<d1b2>
<Attie> I'm also wondering about alternate parts for the Pink LED (OSK40603C1E) - I'd like to keep the flag
<d1b2>
<Attie> (it seems to be a little obscure, but I'm hoping the cm can source from LCSC)
<tnt>
the 20021121-00044T4LF is 44 pins not 40.
<d1b2>
<Attie> oop, did i miscount?
<tnt>
I think FTSH-110-01-L-DV-K-TR is the originally planned connector with keying.
<tnt>
As for the leds beware that changing them might unbalance their brightness. Each resistor has been manually calibrated for that specific led part number to provide uniform brightness and not too dim, not too bright.
<d1b2>
<Attie> J5 is 44 pins, correct? (2x22)
<tnt>
Didn't check ... Ijust know that the 2 references you posted have different pin count :p
<d1b2>
<Attie> the schematic seems to reference the 40-pin mating connector
<d1b2>
<Attie> ha, okay, yes. i think the "suggested mating connector" part number is incorrect in that case
<d1b2>
<Attie> re LEDs, yes I was aware of that - i'm hoping to source from LCSC, so we should be fine
<d1b2>
<Attie> FTSH-110-01-L-DV-K-TR is also a 40 pin part... hmm
<d1b2>
<Attie> oh, no... it's a 20 pin part - I'll use the FTSH series 40-pin equivelant with keying
<d1b2>
<Attie> gosh, I shouldn't be doing this now... I'll use the FTSH series 44 -pin equiv, with key
<d1b2>
<Attie> agreed - thanks for confirming, I can be bad with numbers as may have been evidenced above
<electronic_eel>
Attie: there was a bug in the schematics regarding the suggested mating connector. I think it has been corrected now in the kicad files, but not in the pdf in the revC1-subdir
<d1b2>
<Attie> ah, thanks - I was indeed looking at the PDF
<electronic_eel>
just use the kicad files, there you also find the suggested part for J5, which is FTS-122-01-L-DV
<d1b2>
<Attie> will do, I hadn't expected the PDF / BOM to be out of alignment with the KiCAD files - I presume these are changes since revC1?
<electronic_eel>
It might be
<electronic_eel>
I don't remember
<d1b2>
<Attie> ok, no problem
<electronic_eel>
I just remember that I fixed the suggested mating connector at some time
<electronic_eel>
for revC2 esden has also added holes to the board, so you can uses connectors with alignment pins
<d1b2>
<Attie> ok - i was going to run with the revC1 files, would you advise using the revC2, even though it's WIP?
<electronic_eel>
revC2 is nearly finished design wise, maybe 1 or 2 weeks till it is done and esden orders test boards
<electronic_eel>
it will have several design-for-manufacture improvements and also new features
<electronic_eel>
but we changed the adc and there is no firmware support for the new one yet, so the prototypes will not immediately work
<electronic_eel>
so the question is how fast do you need the boards
<d1b2>
<Attie> interesting, thanks - I had a feeling they were a little further out than that
<d1b2>
<Attie> i'll put it to the group, I'd personally be happy to have a revC1 sooner (even if only by a few weeks - month or two), and potentially get a C2 once they're in production
<electronic_eel>
you can take a look at the progress in the wip-revC2 branch
<electronic_eel>
if you plan to build more than a handful of boards, you'll probably prefer the revC2 because of the dfm improvements. the old footprints for the level shifters, tvs diodes and resistor arrays weren't optimal and caused many people problems
<d1b2>
<Attie> i see, thanks
<electronic_eel>
now I can't guarantee that revC2 will fix them all, but at least we tried :)
<d1b2>
<Attie> ha 🙂
<d1b2>
<Attie> do you know if the issues were primarily around hand assembly, or if getting someone to do a pnp run reduced the issues?
<electronic_eel>
it was mostly reported from people doing hand assembly and probably having non ideal soldering profiles
<d1b2>
<Attie> I've already had people express interest in ~50 boards, so I wouldn't call it a small run...
<electronic_eel>
but even esden with his pnp and experience with his solder profile had to do several reworks IIRC
<d1b2>
<Attie> I was planning to over-order by a margin to deal with some level of problems, but if the failure rate might be higher than 5-10%, then it may be problematic
<d1b2>
<Attie> ok, good to know, thank you
<d1b2>
<Attie> rework isn't a scary prospect, but I'd obviously like to avoid it if possible
<electronic_eel>
oh, and the selftest isn't fixed yet. so it is more complicated to figure out where the problems with the shifters, tvs and resistors are
<electronic_eel>
but that is "just" a software thing that can be fixed with some effort of re-thinking the selftest procedure
<electronic_eel>
about "scary": have a look at the level shifter size and footprint, they are tiny and love to create shorts. so you need proper equipment and a bit of experience for reworking them
<electronic_eel>
with revC2 we switched to sot-363 / sc-70 for the shifters, which is easy to solder even by hand and shouldn't create any problems
<d1b2>
<Attie> understood
<noopwafel>
they are definitely ok to rework but it's a bit annoying and impractical if you want a lot of them
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<awygle>
woohoo, i am a team boi now (for some reason)!