On Fri, 11 Jan 2019 10:36:43 +0100, Bernd wrote:

> (Fans are noisy ...)

Hi-speed fans are noisy, low-speed ones aren't.

Fit a 40mm 5V fan (eg CPC MF67761, lots of blade area, quoted 27 dBA)
that'll be pretty quiet connected directly to 5V.

Want quieter feed it via transistor from a GPIO producing a PWM
signal under software control. Can arrange for it to only run when
required and only as fast as needs be. Note if going from stopped to
moving it might need a brief full whack burst to get it going. Donno
how easy getting the CPU temp is (or isn't).

--
Cheers
Dave.

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