LED cir.

Discussion in 'General Electronics Chat' started by conntaxman, Feb 4, 2010.

  1. conntaxman

    Thread Starter New Member

    Oct 30, 2009
    12
    0
    would anyone have or could make a drawing to connect 4 leds in pararell using a LM338 regulator.It can handle up to 5 amp.
    The forward voltage is 3.5 current is 700ma and supply voltage is 12vdc.wattage for each led is 3 watts.
    Im just looking for a small cir. for this.
    tks
    John
     
  2. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    led's should not be connected in pararell but in series or each needs a seperate controller.
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The forward voltage of an LED is a range of voltages. It might be 3.2V, 3.5V or 3.8V.

    You must use a resistor or a circuit to limit the current. A voltage regulator can be used to power incandescent light bulbs, not LEDs but it can be made into a current regulator.

    Don't over-heat the LEDs by running them at their max allowed current unless you separate them and cool them properly.
     
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