reducing 12V+ source voltage with a potentiometer

I would like to reduce the 12V+ source voltage going into computer fans
with potentiometers place between the 12V+ and the fan. I am unsure
what Ohm rating potentiometer I need to get could someone please help.


All I remember from physics class was that V=IR formula. So I guess
that means R=V/I = 12/I The fan has a label that says 0.8A on it. So
I guess that means R=12/0.8 = 15 Ohms max ? Kinda small? I only have
on hand a potentiometer that say 15K ohm.

Could someone please share me their experience using pots to
dynamically reduce a 12V source voltage.

.

Relevant Pages

  • Re: reducing 12V+ source voltage with a potentiometer
    ... >I would like to reduce the 12V+ source voltage going into computer fans ... >with potentiometers place between the 12V+ and the fan. ... >what Ohm rating potentiometer I need to get could someone please help. ...
    (sci.electronics.design)
  • Re: reducing 12V+ source voltage with a potentiometer
    ... > what Ohm rating potentiometer I need to get could someone please help. ... > dynamically reduce a 12V source voltage. ... It's not the ideal way to control a fan but it should work ok. ...
    (sci.electronics.design)
  • Re: reducing 12V+ source voltage with a potentiometer
    ... > what Ohm rating potentiometer I need to get could someone please help. ... > dynamically reduce a 12V source voltage. ... There are several ways to control a 12V fans speed but a potmeter is the ... You can try to find a linear voltage controler or a PWM circuit. ...
    (sci.electronics.design)
  • Re: KAS 297B Altitude Preselect question
    ... get a 500 ohm potentiometer across the output and ground and wire the wiper so as to make it the new output line -i.e. ... If you can only fit an inline resistor into the signal line, try several values from say 100 ohm up until you get a suitable (still loud) volume. ...
    (rec.aviation.owning)
  • Re: Treadmill motor/controller Potentiometer?
    ... Radio Shack is probably the easiest place to buy one ... ... and the pot turned all the way counterclockwise is ... Use a simple ohm meter to check it, ... and now need to buy the potentiometer. ...
    (rec.crafts.metalworking)