Fan speed controller

Discussion in 'General Electronics Chat' started by The.Sniper, Aug 8, 2009.

  1. The.Sniper

    Thread Starter Member

    Aug 8, 2009
    All I am new to the forum. so "Hello"

    I have a 12 v DC fan which pulls 8.0 amps.
    it has 2 wires. and can easily reverse direction by reversing the wires.
    my goal. is to have it pull less amps (sacrifice speed is not an issue)
    can I just install a resistor? OR install a potentiometer or similar

    It works fine right now its quite noisy at full speed. I tried it @ 6.0 volts
    it works nice. after much investigating. Would a speed controller do the same job of allowing me to reduce the voltage draw at the cost of speed?

    What would be the least expensive route? and end up pulling less amps?

    This is in my vehicle and in the event its running while Im away from my car. I dont want to come back to a dead battery. hence the reduction in amperage usage

    Thanks in advance all!
  2. mik3

    Senior Member

    Feb 4, 2008
    What is the purpose of this fan on the vehicle?
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    I think the best thing would be to use a Pulse-width modulation (PWM) approach. It can be done quite simple with few components.
  4. HarveyH42

    Active Member

    Jul 22, 2007
    For blowing hot air on his dogs, so the cops don't hassle him about leaving them in the parked car. He has another thread, same project, different approach.