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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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      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
    2. 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
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    3. 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
    4. 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
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    6. Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @bofh453 @ChrisDaviesw

      There is actually a resistor on board the laser (it's meant for 3V 40mA). It's quite underdriven anyway, probably due to the wimpy drive strength of the S/PDIF encoder IC. It definitely won't pump out 40mA so I could probably get away with shorting the resistor.

      2 replies 0 retweets 1 like
    7. Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @marcan42 @bofh453 @ChrisDaviesw

      Keep in mind the original TOSLINK transmitter has a built-in monolithic driver. This is connected *before* that, to a logic-level S/PDIF signal.

      1 reply 0 retweets 1 like
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    10. Hector Martin‏ @marcan42 23 Jun 2018
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      Replying to @bofh453 @ChrisDaviesw

      I know the driver is just a buffer, what I mean is that there isn't even anything intended to drive a load now, just a wimpy logic level output :-)

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

      So now the question is, if these uber-cheapo LDs can be trivially driven at 6MHz bandwidth without issue, what's the limit? Can they do 20? 50? 100?

      6:44 AM - 23 Jun 2018
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      • 🇪dith 🅱️inch Chris Davies
      0 replies 1 retweet 2 likes

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