Emergency 12V fan/light

Discussion in 'General Electronics Chat' started by john.snow, Dec 17, 2015.

  1. john.snow

    Thread Starter New Member

    Dec 17, 2015
    3
    1
    Hello everyone,

    I have been working on an emergency 12v fan and light system for camping. However, I keep getting stuck with burnt resistors and POTs when trying to control the fan's speed. Moreover, I wanted to to take a different approach by using PWM (555 timer) circuit, but I really have no idea how to use it. The fan I am using is a 12vdc car (lighter plug) fan which draws current of 2.5 amps. I've read that you can achieve high frequency pwm using this circuit. Another question, Is it possible to build a circuit that will control the fan at very low speed with least motor kick.

    Pardon me for my lack of understanding.
     
    RRITESH KAKKAR likes this.
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  3. dl324

    Distinguished Member

    Mar 30, 2015
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    Your first post... Welcome to AAC!

    Post a schematic and someone might be able to help you make it work. Sounds like you could be using your pot as a rheostat and exceeding it's power rating.
     
  4. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,130
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    And beware that some brushless type DC fans do not like PWM.

    It can crash the electronic commutator chip in the fan.

    Some have actual PWM inputs...
     
  5. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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    Hello,
    I have done this with pic micro 16f676 & 877A and H-Brigdes
    do you nee code?
     
  6. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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  7. john.snow

    Thread Starter New Member

    Dec 17, 2015
    3
    1
    Thank you guys, I have been able to fix it.
     
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