Re: reducing 12V+ source voltage with a potentiometer
- From: bigcat@xxxxxxxxxxx
- Date: 19 Apr 2005 08:37:02 -0700
Joseph wrote:
> 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.
thats the approx R of the fan, not the R of the pot you want. But its
not far off. A bit higher would give more v reduction range.
I'd double check your fan ratings though, that does sound high.
> Could someone please share me their experience using pots to
> dynamically reduce a 12V source voltage.
Its the simplest way - for a one off theres no reason to get into
complex electronics whena simple cheap pot does the trick. Either use
a 1w pot or else put your chosen pot in the airstream. Or you can just
use a bit of resistance wire and a croc clip etc to tap off where
wanted. R wire: heater elements, light bulb filaments, etc.
NT
.
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