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Adjusting LED color temp?

Discussion in 'LEDs and Optoelectronics' started by lynkynpark86, Mar 26, 2012.

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  1. lynkynpark86


    Oct 22, 2011
    I want to make a light that has 4 white LEDs, a red LED, and a blue LED. I want to have a know that controls the blue-red ratio. Is this possible with only a variable resistor (highest resistance = red at capacity, blue off; lowest resistance = red off, blue at capacity)?
  2. XmodAlloy


    Mar 21, 2012
    That is certainly possible! You simply need a pulse width modulator and an output inverter. Run the blue off the PWM output and the red LED off the inverter.
    I personally like this: PWM schematic, very easy to build on a single layer board.
    Good luck!
  3. KJ6EAD


    Aug 13, 2011
    What are you using for power; batteries, regulated supply or unregulated supply?
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