LED - multiple source, different currents...

Discussion in 'The Projects Forum' started by volvomad, Nov 24, 2010.

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  1. volvomad

    Thread Starter New Member

    Mar 7, 2009
    I am trying to do a constant current circuit for my car. The outline is as follows:

    7 x 3.2v White LEDs driven off the sidelights
    6 x 2.1v Yellow LEDs driven off the indicators
    9 x 2.1v Yellow LEDs fed with 1mA with sidelights, but at 25mA with the indicators.

    I can build constant current circuits for the 7 white and 6 yellow LEDs, but I'm not sure how to do the 9 yellow LEDs that have multiple currents from 2 sources.

    Can anyone help?
  2. bertus


    Apr 5, 2008
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