determine resistor for LED

Discussion in 'The Projects Forum' started by risky fajar, Oct 20, 2014.

  1. risky fajar

    Thread Starter Member

    Oct 8, 2014
    41
    0
    hill all... i will questions.. how to determine resistor can be used LED with working voltage of LED 2 volt and LED series structured as much 500 LED..thanks
    risky
     
  2. flat5

    Active Member

    Nov 13, 2008
    403
    17
    Trying to understand you.
    You have 500 LEDs that you want to put in one series string.
    You expect each LED to drop the voltage across it by 2 volts.

    Why one long string of 500?
    Why not 20 strings of 25?
    The voltage required will be much safer to work with.
    (Less risky)

    We need more information about the LEDs.
    What current does each LED need?
     
  3. risky fajar

    Thread Starter Member

    Oct 8, 2014
    41
    0
    LEDs current is 1 mA... and LED string series.... and only one source voltage...whether 500 leds string series and how drop voltage on each conettions LEDs...??? thanks
     
  4. flat5

    Active Member

    Nov 13, 2008
    403
    17
  5. risky fajar

    Thread Starter Member

    Oct 8, 2014
    41
    0
    oke thanks for your answer
     
  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    2V per led and 500 in series, thats 1000V , OUCH!
     
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