powering led help!!!

Discussion in 'The Projects Forum' started by angryguywalking, Apr 10, 2009.

  1. angryguywalking

    Thread Starter New Member

    Apr 10, 2009
    1
    0
    hey guys im kinda new to electronics and i need help powering an led.

    The LED is 3.6 V and i want to power it with a battery pack that holds 4 AAA batteries. i know that 4 AAA's=6 V which is too much so i just want to use 2 batteries in the pack instead of four which makes 3 V which will power it enough. does anyone know how to do this?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    4 AAA "normal alkali" batteries will give 6 Volts, as each cell will give 1.5 Volts.
    When you use NiMH or NiCad cells the voltage will be lower.
    To power a led, you must know its voltage drop and its current.
    Take a look at this page with led circuits:
    http://www.educypedia.be/electronics/circuitsled.htm

    Greetings,
    Bertus
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A brand new alkaline AA cell is 1.5V to 1.6V. Four in series make 6V to 6.4V, not 9V.

    Your "3.6V" LED might be 3.2V or 3.8V or in between volts. It won't light with only 3V from two battery cells.

    A solar garden light uses an electronic circuit to boost the 1.2V from a rechargeable battery cell to 3.6V to light a white or multi-colours LED.

    Look in Google for Joule Thief. It is a small simple electronic circuit that boosts 1.5V to enough volts to light a 3.6V LED.
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
  5. xenon art

    New Member

    Apr 11, 2009
    1
    0
    Hi,
    I've found another circuit on
    http://control7.net/electronics/single_cell_LED_flasher.html
     
Loading...