Mike Walters

@assortedhackery

Electronics, RF, reverse engineering. Author of inspectrum. MM0MZW. he/him

Joined March 2014

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  1. Feb 1

    Smoke test passes, and a quick test with the GreatFET puts it into RX mode successfully 🙂

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  2. Jan 31
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  3. Jan 31

    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.

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  4. Jan 31

    First go was surprisingly good, but I think I smudged it a little on release. Should still work fine!

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  5. Jan 31

    All ready for paste application. I've not done this in a _while_ so this might take some tries.

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  6. Jan 31

    Time to do some assembly! First job is to depanel these stencils...

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  7. Jan 30

    and.. there's the problem - some of the traces are completely blown out. Someone put way too much power into this at some point 😟

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  8. Jan 30

    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.

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  9. Jan 30

    Some more detail of the PCB

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  10. Jan 30

    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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  11. Jan 30

    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.

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  12. Jan 30
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  13. Jan 30
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  14. Jan 27

    Thermocouple interface boards arrived from so I can finally fix up 's T962A reflow oven!

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  15. Jan 25

    Took a punt on this reference attenuator on ebay, to go with some cheap power sensors I got recently, but it seems just a *little bit* out of spec. The seller was nice about it, so it's teardown time once the refund clears!

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  16. Retweeted
    Jan 22

    Testing a 1Gbps Ethernet & PicoRV32 SoC (UART over Ethernet) built with LiteX/Yosys/Nextpnr on the 15$ ECP5 board (documented by and )

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  17. Jan 20

    yay, PCBs. I worked with on a new revision of his SX1257 PMODs - I'm looking forward to getting these built up and trying them out! Also I had some space on the stencil, so I panelised a couple of other projects - I wonder whether anyone can spot what they are?

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  18. Jan 17
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  19. Jan 17

    I used 's great technique of programming a UART on every pin that transmits the pin name, and started reverse-engineering the pin-out here:

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  20. Jan 17

    Got my Colorlight 5A-75B yesterday 🥳 This is a ~£15 board meant for driving LED walls, but it's got an ECP5 FPGA on it so it can be re-programmed using the open source tools Yosys+nextpnr!

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