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PWM fan speed controller.

Discussion in 'General Electronics Discussion' started by jackytwoshoes, Nov 8, 2012.

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  1. jackytwoshoes

    jackytwoshoes

    6
    0
    May 17, 2012
    I've got a projector mounted in a funny location and I need to cool it with an auxiliary fan.

    If I use a PC case fan with a Zalman or similar speed controller and a 12v supply will that work?

    I know the speed controller outputs PWM to the fan, but the controller also has a 3 pin input. Can I ignore the 3rd pin and just give it 12v?
     
  2. donkey

    donkey

    1,293
    56
    Feb 26, 2011
    the 3rd pin is usually there to calculate rpm so rather than an input it outputs 1 pulse every rotation.
     
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