Wiring Different color LEDs in series

Discussion in 'General Electronics Chat' started by live4soccer7, Jun 10, 2008.

  1. live4soccer7

    Thread Starter Well-Known Member

    Jun 7, 2008
    88
    0
    This is a pretty simple question, I need to wire up two LEDs one blue and one red. Can I wire them in a series, if not then can you do it in a parallel, or is this not possible at all? If this is possible how do I calculate the resistance needed for these bad boys.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You will only be able to wire them in series. In parallel, the red LED will be the only one to conduct, as the blue ones take more voltage before they go into conduction.

    Add the forward drops of the LEDs together, and subtract that figure from the source voltage. That is the voltage remaining to push current. Use R = E/I to get the current limiting resistor. 10 ma current is good to aim for.
     
  3. live4soccer7

    Thread Starter Well-Known Member

    Jun 7, 2008
    88
    0
    Thanks, worked like a charm.
     
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