Re: reducing 12V+ source voltage with a potentiometer
- From: "petrus bitbyter" <p.kralt@xxxxxxxxx>
- Date: Mon, 18 Apr 2005 18:50:32 GMT
"Joseph" <spmok2@xxxxxxxxxx> schreef in bericht
news:1113846406.626645.149360@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>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.
>
There are several ways to control a 12V fans speed but a potmeter is the
worsed. You can try to find a linear voltage controler or a PWM circuit. I
have no circuits here at the moment but a little googling will make you find
what you need.
petrus bitbyter
.
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