cipher_nemo,
I haven't seen a DC fan that can't be PWM controlled. It's just a matter of frequency. Get it well over 20KHz and you won't have any possibility of a human hearing it. Of course there are a few other tricks to help too, but I wouldn't want to give away all of our secrets
Fan controller?
Moderator: Mods
The one benefit of pulse (on your previous units) was the 'strobe' effect.Paradigm wrote:No, you're not hearing things. Our previous motor controller did use pulse control, however it did it at a much slower rate. The result is that there are artifacts within the audible range. On some fans, you really couldn't hear it. On others, you definitely could.
If we do go pulse control on this next one, it will be in the order of 1000 times faster. This would push any artifacts, or harmonics there of, way out of the realm of human hearing.
On my unit my fans appear to either be still or turning VERY slowly... Looks VERY cool!
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- LCD?
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