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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


    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


    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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