[mythtv-users] Quiet CPU Cooler Recommendations

[Brian Wood]

On Jan 26, 2007, at 4:41 PM, Robert Johnston wrote:

> On 1/26/07, Kirk Bocek <t004 at kbocek.com> wrote:
>> Calin, where did you find the slow moving case fans? That's one  
>> thing I've
>> never been able to find. Those with one of the fanless CPU coolers  
>> might be
>> what I'm looking for.
>
> There's 2 (main) methods to get slow-moving case fans.
>
> 1: Modify the fan connector so that it goes to the red and yellow
> wires, rather than the yellow and black. This will give it a voltage
> of +7v, rather than the regular +12v. The fan will still start, but
> won't spin so fast.
> 2: Place a resistor (Fixed or variable for speed adjustment) inline
> with the fan. This will allow you to control the speed of the fan.
>
> 3: Build a PWM circuit. This will enable you to dial the fan all the
> way down without stalling, but can cause "growling" sounds at low
> RPMs, and will also mean you can't use RPM monitoring.
>

Or just use one of the commercial fan controllers that have thermal  
sensors. That way you can run quietly but be sure the fan will speed  
up if it has to to protect your hardware.