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Thread: rheostat for led's in a car

  1. #1
    browser90 Newbie
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    rheostat for led's in a car

    I'm trying to find a rheostat that can dim the LED's in my car. The stock rheostat in the car doesn't work with LED's and they are a little too bright for comfort. What is there to buy that would dim 12volt LED's?


  2. #2
    Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent Hero999 Excellent
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    A PWM controller - a 12V motor speed control is perfect.

    I do not answer private messages asking for help because no one else can: benefit from advice I may give or correct me if I'm wrong.

    Please ask on the open forum if you have a question and I'll be happy to help,
    if I know the answer.

  3. #3
    browser90 Newbie
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    Thanks! I'll look into that, or if you have a direct link to one please post it.

  4. #4
    Boncuk Excellent Boncuk Excellent Boncuk Excellent Boncuk Excellent Boncuk Excellent Boncuk Excellent Boncuk Excellent
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    rheostat for led's in a car

    Here is a simple circuit controlling the LEDs PWM.



    The frequency is 2.8KHz. If you want e.g. 280Hz just replace C1 by 100nF (now 10nF)

    Note: 100% output will be at the lower end of RV1. The circuit controls from zero to constantly 100%. Adjust the current limiting resistor (R3) according to the requirements (no of LEDs in series for instance).

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