"Newbie needs help" potentiometer as rheostat

Discussion in 'The Projects Forum' started by dvd223, Feb 28, 2009.

  1. dvd223

    Thread Starter New Member

    Feb 28, 2009
    3
    0
    trying to use on a 12v spotlight to turn down the intensity of the light but i need some kind of heatsink or resistor. I tryed a 50k .5watt pote. by itself and as soon as you turn it down it fry's

    Thanks,David


    (added)dc 12volt Sealed beam 7.36-amp spotlight which produces 200,000 CP
     
    Last edited: Feb 28, 2009
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Is the voltage 12 Volt AC or DC ?
    How many Watts is the spotlight ?
    If it is DC you can use a PWM circuit to dim the spot.
    If it is AC you could use phase cutting.

    Greetings,
    Bertus
     
  3. dvd223

    Thread Starter New Member

    Feb 28, 2009
    3
    0
    12 volt (dc voltage) Sealed beam 7.36-amp spotlight which produces 200,000 CP
     
    Last edited: Feb 28, 2009
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Again is it working on AC or DC voltage ?
    This will give info on how to dim the spotlight.

    Greetings,
    Bertus
     
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