Re: PWM for noiseless cooling fan

artem0nnospam@xxxxxxxxx wrote:
> PWM for noiseless cooling fan
>
> sci.electronics.design
>
> As summer is coming fast I do miss my expired old cooling fan lasted
> 10yrears and seems impossible to find an AC fan with continuous speed
> control in Europe. (if anybody has an idea...)
>
> So my project for this weekend is to make a DC fan (from PC) diameter
> 90mm or 120mm. 12V with PWM.
>
> I read a fair amount on the net and most posts here are about high
> current applications. I want to know if frequency of PWM is important
> to keep the fan noiseless. As it is the purpose of using PWM to keep
> rotation speed low. some quality PWM I found ready made use 25kHz:
> Q: would that frequency be a problem for a small PC cooling fan?

http://www.ebuyer.com/ (or similar in your country).
Purchase a variable speed cooling fan, for several pounds/..., add a variable
resistor to the speed control input, and job done.
I also found (from ebuyer) that the 60p 12cm fans run absolutely noiselessly
and start reliably on 3.3V
.

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