<Joerg-Neo900>
houkime: please check docs/hw/Nokia_N900_RX-51_Schematics.pdf et al... in maemo.cloud-7.de/_hidden and NEVER EVER post the concatenated URL so spiders could start searching it! If this happens, the URL vanishes in no time
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<Joerg-Neo900>
you can search dirs up to docs/
<Joerg-Neo900>
all of this stuff is (or was) publicly available, but I collected it for convenience reasons
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<houkime>
replacing D1902 (zener in backlight regulation) with BZX884
<houkime>
(it needs to be able to regulate either on the 10.5v level or 21v level)
<houkime>
depending on serial or parallel connection of backlight LED rows
<houkime>
BZX884 series contains parts for both voltages with the same footprint
<houkime>
it is also new (2018) and small
<houkime>
previous zener there was misrated and too weak.
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<houkime>
replaced
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<Joerg-Neo900>
>><houkime> BZX884 series contains parts for both voltages with the same footprint<< :thumbsup:
<Joerg-Neo900>
>>too weak<< it only triggers a shutdown, doesn't regulate by itself
<Joerg-Neo900>
zhere's a R1917 which I just "invented" :-D
<houkime>
it is actually how i found it in regulator datasheet as one of the applications so it wasn't looking suspicious for me.
<Joerg-Neo900>
looks good but I have no idea who and when designed this
<Joerg-Neo900>
DNP comment oon R1912 and 1914 missing
<Joerg-Neo900>
aaa nope, all fine
<Joerg-Neo900>
they are "[ serial]"
<Joerg-Neo900>
bug: R1917 1k to allow Zener to pull ip FB
<Joerg-Neo900>
check if that complies with FB impedance
<Joerg-Neo900>
if needed, make it 100R
<houkime>
ok.
<Joerg-Neo900>
rationale: when user operates device without display connected, avoid overvoltage from missing feedback to FB. But also avoid Zener and R1916 consuming the full power (10V * 40mA?) usually consumed by display backlight
<Joerg-Neo900>
it's actually *possible* that Metacollin discussed this with me and added the Zener
<Joerg-Neo900>
...and I forgot
<Joerg-Neo900>
houkime: did I already thank you for the great work?
<Joerg-Neo900>
a pity it can't help the project anymore
<houkime>
i don't think the life of the project has anything to do with what you or me think about the current status.
<houkime>
it is opensource now completely.
<houkime>
people decide what to do with it
<houkime>
i make these changes now for people
<houkime>
in the end, after i am done with it, i can just eliminate N900 compatibility requirement, design a case in a freecad, replace display and retune tracks for new antennas and it will be good to go regardless of part sourcing.
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<houkime>
forgot to correctly place a slide sensor on the UPPER... oops.
<houkime>
luckily a transform is already on hand
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<houkime>
placed and locked
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<dos1>
houkime: still got issues with git repos?
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<houkime>
dos1, no, it is ok.
<houkime>
dos1, checked right now
<houkime>
remote is not too verbose but clone does finish after a long while
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