LED light panel Dc supply help

Discussion in 'The Projects Forum' started by ericval_78, Feb 20, 2013.

  1. ericval_78

    Thread Starter New Member

    Feb 20, 2013
    1
    0
    I am designing an LED light panel with 80 diodes at 4 v power drop and 20 ma forward current + 180 diodes at 3 v and 20 ma. I am not sure where to go from here to figure out what driver or power converter to use to power up my light panel. Can someone direct me on how I calculate this?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    What will be the voltage of the used power supply?
    You can calculate the needed resistor with the following formula:
    R = (Vsupply - Vled) / Iled
    Vled may be the summation of a couple of leds in series.
    For safety the voltage accross the resistor must be at least 2 Volts, for better regulation.

    Bill_Marsden has written a nice thread for the use of leds:
    .LEDs, 555s, Flashers, and Light Chasers

    Bertus
     
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