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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 20 Dec 2020
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      Realised again that some of my electronics tinkering followers may not have watched this incredible talk. It fundamentally changed the way I think about power and signals in circuits. "Where is the energy in a PCB? It's in the fiberglass."https://www.altium.com/live-conference/altiumlive-2018-annual-pcb-design-summit/sessions/extreme-importance-pc-board-stack-up …

      10 replies 56 retweets 297 likes
    2. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @gsuberland

      Shit. I'm 8 minutes in and already everything I thought I knew was wrong.

      2 replies 1 retweet 36 likes
    3. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 23 Dec 2020
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      Replying to @marcan42

      Right!? It's pretty incredible.

      1 reply 0 retweets 8 likes
    4. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @gsuberland

      Hey, uh, @esden? @whitequark? Uh... can I... can I redesign revC?

      4 replies 0 retweets 22 likes
    5. whitequark‏ @whitequark 23 Dec 2020
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      Replying to @marcan42 @gsuberland @esden

      (I've yet to watch the video) so like uh... is there an actual serious problem with revC or are you like memeing?

      1 reply 0 retweets 6 likes
    6. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @whitequark @gsuberland @esden

      I'm, um, half memeing. I hope our board stackup is F-In1-In2-B (In1=GND plane under top side). That part is important @esden. It's actually not too bad, but given what I've learned from that video, I'd replace certain areas of the 3V3 In2 plane with more GND plane and add vias.

      2 replies 0 retweets 10 likes
    7. Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @marcan42 @whitequark and

      looking at revC1 which is what I have lying around here, but I think revC2 didn't materially change the general routing plan?

      1 reply 0 retweets 2 likes
      Hector Martin‏ @marcan42 23 Dec 2020
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      Replying to @marcan42 @whitequark and

      Anyway, I think some use cases would probably never pass EMI testing, but I guess we were never going for that (not like we can guarantee it with user logic).

      8:29 PM - 23 Dec 2020
      • 3 Likes
      • Jessica 🌙 FIPSmode Squad whitequark
      0 replies 0 retweets 3 likes

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