Moin Bert,
On Mon, 21 Jul 2014 09:02:12 -0400 (EDT)
[email protected] wrote:
> The challenge is reliable fan start at low voltage if you want the unit
> stay constant over an ambient change of 10 C. Members have talked about u
> processor control but I have not seen any thing that works, many of the heat
> pipes used in laptop do have digital speed control, some one please step up
> to the plate.
How about doing it the old analog way? Feed the output of the
PID controller to comparator together with a sawtooth signal.
That will give you a quite nice 0-100% PWM control.
I'm quite sure a similar solution is possible with a NE555 as well.
Of course, you would need to adjust the PID controller parameters
to accomodate for the new element in the control loop.
Attila Kinali
--
I pity people who can't find laughter or at least some bit of amusement in
the little doings of the day. I believe I could find something ridiculous
even in the saddest moment, if necessary. It has nothing to do with being
superficial. It's a matter of joy in life.
-- Sophie Scholl
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