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wiring multiple leds - pc modding

Discussion in 'Electronic Basics' started by [email protected], May 18, 2005.

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  1. Guest

    i wish to wire 6 (or x number) of the same led, using a psu - 12v line.
    Most probaly it will be an orange led, thought i should say that as
    i've read that the actual colour will effect the resistors that so
    So simply whats the best way .... ?
  2. John Bokma

    John Bokma Guest

    find out the Vforward and Iforward for the LEDs you are going to use

    (12 - x * Vf)
    R = -------------
  3. Guest thing though
    could you elaberate on Vforward and Iforward ((If Vf)?!
  4. Bob Monsen

    Bob Monsen Guest

    Put them all end-to-end (in series) and put a 1k resistor in series too.
    That should light them up with 3.6mA. If you want them brighter, use a
    lower value resistor, but too low will cause them to fail. The lowest
    you probably want to go is 220 ohms.
  5. John Bokma

    John Bokma Guest

    Those values are given in a datasheet. Vf is different for LEDs with
    different colours. If is often around 20 mA, but look it up.


    Vf = 1.7
    If = 20 mA

    ( 12 - 6 * 1.7 ) / 0.02 A = 90 Ohm.

    So use a 100 Ohm resistor in this case.
  6. John Bokma

    John Bokma Guest

    Hence: look up Vf and If, and *calculate*
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