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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. Hector Martin‏ @marcan42 15 Jul 2019
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      So, uh, if you have an M-Audio Keystation Mini 32 and the USB connection is flaky or does not work on some computers, try reducing the series D+/D- resistors from 100Ω to 33Ω and removing the janky looking common mode choke. Turns out following the IC datasheet helps.

      1 reply 6 retweets 57 likes
    2. matthew venn‏ @matthewvenn 15 Jul 2019
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      Replying to @marcan42

      Maybe they needed it to pass EMC

      1 reply 0 retweets 3 likes
    3. Hector Martin‏ @marcan42 15 Jul 2019
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      Replying to @matthewvenn

      Yeah, but I get the feeling this janky thing isn't rated for differential data.pic.twitter.com/6Qo5Orj11f

      2 replies 0 retweets 8 likes
    4. Hector Martin‏ @marcan42 15 Jul 2019
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      Replying to @marcan42 @matthewvenn

      Also USB isn't actually (only) differential, so a common mode choke is a terrible idea.

      1 reply 1 retweet 6 likes
    5. doragasu‏ @doragasu 15 Jul 2019
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      Replying to @marcan42 @matthewvenn

      Using chokes on the PCB for differential pairs faster than USB Full-Speed is usually a very bad idea, and the USB standard recommends against it.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 16 Jul 2019
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      Replying to @doragasu @matthewvenn

      This is FS, but it still messed it up.

      5:34 AM - 16 Jul 2019
      1 reply 0 retweets 0 likes
        1. doragasu‏ @doragasu 16 Jul 2019
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          Replying to @marcan42 @matthewvenn

          Not surprising, seeing the size of the choke.

          0 replies 0 retweets 0 likes
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