Should I use an ebay step-down module to get the voltage from a laptop power supply to 12V?

Discussion in 'Power Electronics' started by FranciscoB, Jun 29, 2016.

  1. FranciscoB

    Thread Starter New Member

    Feb 8, 2014
    14
    1
    I'm looking to replace the old fluorescent bulb lighting of my small aquarium (10 liter). Led strips are readily available and I have a 16V Asus laptop power supply with a broken connector. I would like to ask if I can use one of these modules to step it down to 12V:

    http://www.ebay.com/itm/1pcs-1-23V-...dule-LM2596-Power-Supply-Output-/400985220074

    I already have one of these LM317 circuits. Could it be used instead?

    Led Strips (I would not be using the whole 5M, maybe 4 sections of 40cm positioned side-by-side but in series):

    http://www.ebay.com/itm/5M-300LEDs-...-Lights-Super-Bright-Waterproof-/231472954932

    Power Supply:

    http://www.ebay.com/itm/19V-AC-Adap...452904?hash=item43d337b7a8:g:rpgAAOSwiCRUc~U4

    Thank you in advance
    /F
     
  2. FranciscoB

    Thread Starter New Member

    Feb 8, 2014
    14
    1
  3. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
    1,215
    I think it would work fine. I would go with the LM2596 switching converter.
     
  4. dannyf

    Well-Known Member

    Sep 13, 2015
    1,809
    362
    Get a sense of the current consumption of the LEDs. If it causes significant dissipation over the lm317 (5w or more), I would consider alternatives.

    Also, understand how the LEDs should be powered.
     
  5. FranciscoB

    Thread Starter New Member

    Feb 8, 2014
    14
    1
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    Yes use the Lm2596, you can get a ready-made one on ebay..
     
  7. FranciscoB

    Thread Starter New Member

    Feb 8, 2014
    14
    1
    Thank you.

    (Go Reds! \o/)
     
    Dodgydave likes this.
  8. Colin55

    Member

    Aug 27, 2015
    191
    19
    You don't need full brightness. Just put two lengths (same length) in series.
     
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