Mountaindude has been spending some time lately working on 12V fan controllers and thought he’d share his experiences so far.
“While trying out various computer and network gear, I quite often find the fans too loud. They are of course there for a good reason, but experience tells that the device usually works just fine with less cooling.
Going through a 7805 data sheet for other reasons, I suddenly realized that a 7805 set up in variable voltage configuration should work great as a fan controller. These 12V fans usually run just fine down to 5-6 volts, but at lower RPMs, and thus quieter. Just what was needed!”
You can find project details and schematic at Ptarmigan Labs.
Via the contact form.