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Mike Walters
@
assortedhackery
Edinburgh, Scotland
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Electronics, RF, reverse engineering. Author of inspectrum. MM0MZW. he/him
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713
Tweetovi
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509
Pratim
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1.575
Osobe koje vas prate
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Mike Walters
@assortedhackery
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20 h |
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RT @tnt: @42Sec's work on porting gr-osmosdr's #osmocom_fft to Qt and python 3 is now in the gr3.8 branch of git.osmocom.org/gr-osmosdr/log… Please test and report. If no blockers are found, this branch will become the new master and first tagged release with 3.8 support. pic.twitter.com/SqCd5b1oE9
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Mike Walters
@assortedhackery
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20 h |
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is it ok if i manually "retweet" this?
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Mike Walters
@assortedhackery
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2. velj |
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My changes are in the repo above & tagged as RevC. The main change is to fix the RevB errata mentioned in the README. Otherwise, some layout cleanup & the option for a programmable oscillator.
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Mike Walters
@assortedhackery
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1. velj |
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Smoke test passes, and a quick test with the GreatFET puts it into RX mode successfully 🙂 pic.twitter.com/5tgLVtR1bR
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Mike Walters
@assortedhackery
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1. velj |
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I think it's still really interesting if it's made easy to re-target, because then you could use it for bring-up on any new board design.
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Mike Walters
@assortedhackery
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31. sij |
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All done! 🥳 pic.twitter.com/ZbZ1cDH6t9
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Mike Walters
@assortedhackery
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31. sij |
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We won't speak about try #2, but I'm very happy with try #3 aside from maybe a bit too much paste applied? I don't think I was pressing hard enough. I might have trouble with that QFN. pic.twitter.com/u4JPSyJ8SZ
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Mike Walters
@assortedhackery
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31. sij |
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First go was surprisingly good, but I think I smudged it a little on release. Should still work fine! pic.twitter.com/6o571WVT4z
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Mike Walters
@assortedhackery
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31. sij |
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All ready for paste application. I've not done this in a _while_ so this might take some tries. pic.twitter.com/J6hFE374Qv
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Mike Walters
@assortedhackery
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31. sij |
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Time to do some assembly! First job is to depanel these stencils... pic.twitter.com/jGm3Qbj8Bq
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Mike Walters
@assortedhackery
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30. sij |
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and.. there's the problem - some of the traces are completely blown out. Someone put way too much power into this at some point 😟 pic.twitter.com/2bdoIlBPEV
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Mike Walters
@assortedhackery
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30. sij |
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I managed to carefully press the PCB out of its housing. Now we can see what's going on properly! It looks like a Pi-attenuator, with a neat grid structure to allow for trimming resistor values after construction. pic.twitter.com/T2sf6G5D4w
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Mike Walters
@assortedhackery
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30. sij |
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Some more detail of the PCB pic.twitter.com/Ge9kgVOQ8D
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Mike Walters
@assortedhackery
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30. sij |
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The damage on the end wasn't me :) I doubt it happened during assembly, so maybe someone else has opened this up before. I'm not sure if the blackening at the contact point is normal tarnishing, or evidence of too much power going through this part at some point...
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Mike Walters
@assortedhackery
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30. sij |
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The actual attenuator - it looks like a ceramic PCB with printed resistors, plated ends to make contact with the spring-pins, and pressed into this tube to hold it in place. pic.twitter.com/0CwwuLzwxI
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Mike Walters
@assortedhackery
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30. sij |
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Mike Walters
@assortedhackery
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30. sij |
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Teardown time 🙂 pic.twitter.com/vUzXOy4d8x
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Mike Walters
@assortedhackery
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30. sij |
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I had it for free on BT Cellnet somehow though!
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Mike Walters
@assortedhackery
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27. sij |
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Thermocouple interface boards arrived from @oshpark so I can finally fix up @edinhacklab's T962A reflow oven! pic.twitter.com/0rZELz2PTj
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Mike Walters
@assortedhackery
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26. sij |
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Had to be done.. pic.twitter.com/Fduo7Xop1b
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