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What power supply would I need for this and how would my circuit look like?

Discussion in 'Power Electronics' started by DiamondsareMine, Jul 19, 2015.

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  1. DiamondsareMine

    DiamondsareMine

    12
    0
    Jul 19, 2015
    I am making a project involving a LED, a fan, a switch and a Potentiometer and I since I am a new at this, I am having trouble picking a power supply for this.

    Is this one good for this project or would be powerful enough?
    http://www.amazon.com/Power-Adapter-Supply-2-1mm-CCTV/dp/B00452YFZU

    The LED specs:
    12VDC
    20mA
    1.5mcd
    has a integrated resistor

    Fan:
    Rated voltage 12VDC
    Voltage range 10.2-13.8
    Rated current 0.32A max
    Rated Power 3.84W max

    I would like to know how to turn on the LED when I turn on the switch but not effect the speed of my fan. I also wouldn't want the Potentiometer to affect my LED either. How would I do that? Thank you!
     
  2. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    what switch?

    1amp is fine for your requirements... there should be no dimming or anything if wired correctly. ..

    this switch needs to be rated to handle the combined load... 0.5a or so
     
  3. Alec_t

    Alec_t

    2,909
    791
    Jul 7, 2015
    What is the purpose of the potentiometer? A standard pot will burn out if you try to pass 0.32A through it. A pot able to handle that sort of current will be expensive.
     
    Arouse1973 likes this.
  4. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    i've seen 10k 5watt pots for about $3

    but yes, i missed that part, your pot will be doing what precisely?
     
  5. cjdelphi

    cjdelphi

    1,096
    104
    Oct 26, 2011
    pretty cheap for 2$ USD
     

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  6. DiamondsareMine

    DiamondsareMine

    12
    0
    Jul 19, 2015
    I'm trying to control the speed of my fan
     
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