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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 23 Jun 2018
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      Wireless TOSLINK audio. Holy crap, I ran out of desk and it still works. Using two shitty plastic lenses from IKEA lamps. 96kHz 24bit uncompressed. Take that, Bluetooth!pic.twitter.com/Rus4rLaTt8

      18 replies 206 retweets 584 likes
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    2. Hector Martin‏ @marcan42 23 Jun 2018
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      New record: 140cm. I don't think I can go any further with this setup. The alignment is extremely finicky at this point, and any added loss makes it drop out.pic.twitter.com/AKUEbxKUzN

      4 replies 13 retweets 48 likes
      Show this thread
    3. Hector Martin‏ @marcan42 23 Jun 2018
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      To give an idea of the margin: at 135cm it sounds perfect, at 140cm I get the occasional dropout, and at 145cm it's unusable.

      5 replies 2 retweets 30 likes
      Show this thread
    4. Chris Davies‏ @ChrisDaviesw 23 Jun 2018
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      Replying to @marcan42

      Brings to mind an experimental cheap optical link I made in my 1960s teen years. Tx was a torch (had to be “on” for dc bias) with an audio amp (>2W) ac coupled across bulb. Rx was OC71, with paint scraped off, feeding amp/speaker. Worked across room, but how things have moved on!

      1 reply 0 retweets 1 like
    5. Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @ChrisDaviesw

      Hector Martin Retweeted Hector Martin

      Speaking of across the room... https://twitter.com/marcan42/status/1010511381622185984 … I have no idea how this worked, but it did.

      Hector Martin added,

      Hector Martin @marcan42
      I took a $0.65 red laser module and soldered it across the S/PDIF output. No driver. Nothing. It works. There is so much wrong with this I don't even know where to start. This isn't supposed to work! 6MHz on a $0.65 laser pointer?! Thank you China for not adding decoupling caps. pic.twitter.com/oIn9CkQuSU
      Show this thread
      2 replies 0 retweets 1 like
    6. Chris Davies‏ @ChrisDaviesw 23 Jun 2018
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      Replying to @marcan42

      Fascinating thread (follows!). Haven’t tried any of this but strikes me how cheap laser modules are in US. Also UKmax pointer power allowed is 1mW, but 5mW in US, not that this is relevant here!

      1 reply 0 retweets 0 likes
    7. This Tweet is unavailable.
    8. Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @bofh453 @ChrisDaviesw

      It's these:http://www.dx.com/p/6-5-small-pmd-2-5mw-laser-module-boards-golden-5pcs-411012 …

      2 replies 0 retweets 1 like
    9. Chris Davies‏ @ChrisDaviesw 23 Jun 2018
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      Replying to @marcan42 @bofh453

      See they ship to UK despite some being illegal here :( . I’m very wary, having lost vision in one eye following laser surgery. Take care!

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @ChrisDaviesw @bofh453

      These things are <5mW, they aren't going to do any harm. On the other hand, I have some 1W projectors. Those are more fun.

      6:54 AM - 23 Jun 2018
      • 1 Like
      • Chris Davies
      1 reply 0 retweets 1 like
        1. Chris Davies‏ @ChrisDaviesw 23 Jun 2018
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          Replying to @marcan42 @bofh453

          Yes, that *is* a different matter, up to eye surgery power even if not right w/length! Now off to do some holiday packing. Sunglasses essential :)

          0 replies 0 retweets 0 likes
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