Led strips

Discussion in 'The Projects Forum' started by marcolisi, Nov 28, 2008.

  1. marcolisi

    Thread Starter Member

    Nov 18, 2008
    15
    0
    Hello guys,
    I bought a led strip that should be powerd by a battery of :

    12v 160mA

    I do not understand how can I make a power battery with the characteristics above.

    If I connect 12 AA batteries of 2000 mAh , I have and amperage that is bigger than the one required.

    Do I need a resistor and how do I calculate how much the resistor needs to be ?
    thank you

    Marco
     
  2. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    The larger total current capacity of the battery (2000mah) is not a problem and no changes are required. It just means that the larger battery will power the lights for 12X longer time.

    As long as the battery voltage is the same all will work OK. The load (the LED lights) determine how much current is actually being consumed from the battery. I= E/R. I is the current being consumed, E is the battery voltage and R is the load resistance of the lights.

    Make sense?
     
  3. marcolisi

    Thread Starter Member

    Nov 18, 2008
    15
    0
    Hi and thank u so much.
    It makes sense.

    Just 1 more question pls.
    When I want to create a battery pack for a camcorder (for example), and the battery of the camcorder tells me that it is of

    x Volts
    and
    y Amperes

    can I build a battery pack made of AA battery being carefull just to not excede the x volts ?

    What I mean is that as u said , the ampere tells me just for how long the battery will last. The higher the ampere , the longer the battery will last.

    Am I correct ?
    Thank u
     
  4. leftyretro

    Active Member

    Nov 25, 2008
    394
    2
    You are correct. Just be very certain that you wire any new external battery to the correct polarity as many devices have no protection from reverse polarity and can be destroyed if power is applied in reverse polarity.

    Good luck
     
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