Connect with us

Adjusting LED color temp?

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

Scroll to continue with content
  1. lynkynpark86

    lynkynpark86

    8
    0
    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

    XmodAlloy

    11
    0
    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: http://www.robotroom.com/PWM.html PWM schematic, very easy to build on a single layer board.
    Good luck!
     
  3. KJ6EAD

    KJ6EAD

    1,114
    158
    Aug 13, 2011
    What are you using for power; batteries, regulated supply or unregulated supply?
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-