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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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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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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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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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Time to do some assembly! First job is to depanel these stencils...pic.twitter.com/jGm3Qbj8Bq
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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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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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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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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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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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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!pic.twitter.com/VeG6LL8isY
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Mike Walters Retweeted
Testing a 1Gbps Ethernet & PicoRV32 SoC (UART over Ethernet) built with LiteX/Yosys/Nextpnr on the 15$ ECP5 board (documented by
@assortedhackery and@tnt) https://github.com/litex-hub/litex-boards/commit/dcc65b347df4c3e3334fce2a6723a793f60a69a6 …pic.twitter.com/2zQf9VxFWJ
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yay, PCBs. I worked with
@kbeckmann 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?pic.twitter.com/6pEjEgusRb
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I used
@Claude1079's great technique of programming a UART on every pin that transmits the pin name, and started reverse-engineering the pin-out here: https://github.com/miek/chubby75/blob/5a-75b-v7_pinout/5a-75b/hardware_V7.0.md …pic.twitter.com/Bi0aEtadpY
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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!pic.twitter.com/mJAKFm15Uo
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