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    Results 1 to 7 of 7
    1. #1
      Join Date
      Nov 2006
      Location
      Flo-rida
      Posts
      1,204

      How to control LED brightness????????

      Is there a way to control an LED brightness?


      1993 Camaro Z28
      2001 Camaro Z28
      1969 Camaro



    2. #2
      Join Date
      Jul 2005
      Location
      Eastern Virginia
      Posts
      3,963
      Country Flag: United States
      It can be done, but I am not 100% sure how, do you limit the current or voltage? I work at a place with a bunch of electronics engineers, I will find out today & let you know.
      Scot
      86 Monte SS


    3. #3
      Join Date
      Apr 2004
      Location
      OKC, OK
      Posts
      3,739
      Country Flag: United States
      limit voltage

      Mike
      Mike Redpath
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    4. #4
      Join Date
      Jul 2005
      Location
      Eastern Virginia
      Posts
      3,963
      Country Flag: United States
      Here is what he told me:

      Assuming you have a current-limiting resistor in series with your LED, then by varying the voltage across the circuit, you are varying the current through your LED AND the voltage across it. I can't tell you which of these factors changes the brightness, but it will change the brightness. The other common method is to pwm it.

      So I asked what PWM meant:

      Pulse Width Modulate. If you're driving it with a CPU, you turn it on and off really fast. Your eyes can't see the flashing, but the LED looks dimmer, the less percentage the LED is on. If you shake an LED clock radio, you can usually see the LEDs flicker.
      Scot
      86 Monte SS


    5. #5
      Join Date
      Nov 2006
      Location
      Flo-rida
      Posts
      1,204
      Well i hooked up blue leds for my gauges and they dont dim when i turn the knob down.

      1993 Camaro Z28
      2001 Camaro Z28
      1969 Camaro


    6. #6
      Join Date
      Sep 2006
      Location
      Southern Indiana
      Posts
      4,709
      Country Flag: United States
      The resistor in the head light switch is smaller than the one that is inline on the LED(you have to have a resistor inline or a diode goes "pop" when powered up.
      See if your light switch has 100 ohms resistance and the resistor inline on the LED 1000 ohms your light switch wont dim them.

    7. #7
      Join Date
      Jul 2006
      Location
      El Paso, Texas
      Posts
      411
      Try HIDplanet.com under the forums they have a section for LED and a couple of pwm circuits. HTH.

      Alex




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