You can find an interesting solution with the INA330. In the data sheet is described a complete temperature PIDÂ controlled .
http://pdf.datasheetcatalog.com/datasheets/270/255641_DS.pdf Luciano www.timeok.it On Mon 21/07/14 4:02 PM , Attila Kinali wrote: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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts [1] and follow the instructions there. ------------------------- Message sent via Atmail Open - http://atmail.org/ Links: ------ [1] http://webmail.timeok.it/parse.php?redirect=https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
