At one end of the wire is a 3.5 mm Jack plug. On the other end of the wire is presumably a glass LED.

When connected to the phone, nothing happens. The LED does not start to glow.

Also, this wire doesn’t work as a microphone. It’s also not an earpiece.

What is it for?

    • @SlowOP
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      55 months ago

      Can’t it be used as a replacement for the infrared port (if the phone doesn’t have one)?

      • @breakcore@discuss.tchncs.de
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        185 months ago

        Typically IR transmitter LEDs are transparent or light blueish, to allow as many photons as possible to exit the LED.

        Typically IR receiver LEDs are dark, almost black, made to block out visible light and only pass through infrared wavelengths of light.

        Here you see an IR transmitter LED on top and an IR receiver LED below that.

      • Altima NEO
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        45 months ago

        No, since your phone only outputs audio through the headphone jack. These required a PC card that used a jack that’s wired up to use this.

        • @Blue_Morpho@lemmy.world
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          5 months ago

          Audio jack ir blaster adapters for phones used to be common. You can still buy them on eBay.

          Audio is voltage changes which can be set to drive an ir led. You use an app that outputs audio that matches the ir signal protocol.

  • linuxgator
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    375 months ago

    As many have said, that’s an IR receiver. That specific model commonly came with Hauppauge TV tuner cards.

    • Wow, I hadn’t heard that name in so long. I just remembered my Hauppauge TV tuner I had back in the day. Felt like streaming on a computer does today.

      • NickwithaC
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        15 months ago

        You can still get them and there are still over-the-air broadcast channels. TV without a subscription, plus you can record straight to your PC.

        • linuxgator
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          25 months ago

          Yep. Used to record all sorts of TV shows on my computer using them. Though they aren’t nearly as prevalent since Internet streaming has taken over. I doubt I could pick up more than 2 or 3 channels over-the-air where I live anymore.

  • @TechNerdWizard42@lemmy.world
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    55 months ago

    It’s part of an IR Blaster setup. That looks like the “blaster”, aka the IR LED Transmitter. Most receivers have multiple ones to catch reflections and such

      • @TechNerdWizard42@lemmy.world
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        35 months ago

        I also have some that look just like that, and it’s the blaster bit because it stickies directly to the face of the device to control buried in a cabinet. The led is shielded and stuck directly next to the other devices receiver.

        Suffice it to say, there’s no standard. And if the OP doesn’t know what it is, they probably don’t have the rest of it to make it do anything cool. Last I checked they were about $5 on Amazon for the whole getup, so I’d just e-waste that.

  • @Ross_audio@lemmy.world
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    5 months ago

    Some manufacturers use standard audio connectors to carry just plain power.

    They’re robust and can carry relatively high current and voltage.

    It works, I can see why they get used. After all RCAs are on everything for everything.

    I have an e-bike that uses an XLR as a charging port for the battery.

    There’s an IR led on a cable with a 3.5mm jack somewhere that’s an extender for my home cinema system remote.

    (That might be what this is, so see if your phone camera can see the IR light from a TV remote and then test it with that thing)

    This possible LED plugged into something either home made/bespoke, very old, or Chinese.

    Small chance it’s from some medical or scientific equipment that hasn’t moved with the times.

    If it’s an LED put a DC voltage down that plug. If it’s a light sensor, measure for a DC voltage.

    Audio AC signals didn’t have an effect so it’s probably a DC component.

    My bet, point your phone camera at it and put a DC voltage down there in the right direction and you’ll see IR light come out.

    It might be the receiver. In which case you need to monitor voltage. Then point a TV remote at it.