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Electronics Can these LED Strips be powered from a laptop?

Discussion in 'Modding' started by RickDawson, 8 Oct 2010.

  1. RickDawson

    RickDawson Member

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  2. capnPedro

    capnPedro Hacker. Maker. Engineer.

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    Just wire one up to a 12v Wall-wart. One should be available off eBay for about £3 - you only need around 100mA or so.
     
  3. Nealieboyee

    Nealieboyee Packaging Master!

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    If you're talking about usb then NO. These run off 12v, and usb gives 5v at 500mA max.
    The captain is correct. Just buy a wall adaptor. Its cheap
     
  4. RickDawson

    RickDawson Member

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    I'm not talking about USB (I know it's only 5v)

    If I put my tower computer on I can easily power it from the external molex on the back of the PSU.

    I was just wondering if there was some way of getting 12v from the laptop, as I don't always have the tower on.

    I don't want to add any more plugs into the mains sockets. I already use enough from one wall socket.
    (laptop, tower, speakers, router, network switch, DJ mixer)
     
  5. capnPedro

    capnPedro Hacker. Maker. Engineer.

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    The extra 0.025A @ 240v is not going to overload the socket.

    The power would be coming from that socket anyway if the laptop would have been plugged into it. Where's the difference?
     
  6. xXSebaSXx

    xXSebaSXx Active Member

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    Well I think he means he doesn't want the extra wiring... I'd say it may be possible to mod the Lappys PSU (is it one of the external ones? You know the brick at the end of the wire?).. and then run wire along the main wiring all the way into the lappy and set something like a headpone jack on the back that you would use to power the led strip. You could even sleeve the wiring from the lappy to the PSU for a more clean look and to hide the extra wires used to power the leds.

    If the PSU is inside the Lappy, you could just splice wires from the power leads inside and route them to the back into the headphone jack you built into the case.... that would make for a cleaner look.

    Just an idea...
     
  7. RickDawson

    RickDawson Member

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    It's an external transformer. (one of the dell ones)

    Is there any power pins from say the card slot, that could be used?
     
  8. capnPedro

    capnPedro Hacker. Maker. Engineer.

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    Headphone jacks make terrible power connectors because they short when a jack is inserted/removed. Use a proper DC barrel connector instead.
     
  9. xXSebaSXx

    xXSebaSXx Active Member

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    hadn't thought of the shorting part... I was just thinking of a neat way of plugging the led wires to the back of the lappy... but yeah; proper connectors would be better.
     
  10. Tealc

    Tealc New Member

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    I suppose you could splice a connection of the 18v ish laptop power supply and use a voltage regulation circuit to drop down to 12v, still it would be quite messy. Easier to buy a battery or a wall plug and safer.
     
  11. Boscoe

    Boscoe Electronics extraordinaire.

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    I could be wrong but if this is for you mixer why even bother with either comps? Use the mixer power input and use a little PSU inside as theres bound to be room. Just got to remember to shield the psu magnetically from the mixer as it could cause a little interference.
     
  12. SuicideNeil

    SuicideNeil New Member

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  13. RickDawson

    RickDawson Member

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  14. RickDawson

    RickDawson Member

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    Bought the 1m length of blue strip from Maplin.

    currently got it powered from the external molex of my tower pc.
     

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