I came across this link on hackaday.com:

here

Pretty cool, but an awful lot of effort for something you can buy for 20-40 bucks.

Saw this on the Hackaday site and thought it might be of use to some of the more electronically gifted.

Quoted from the build site - "After some bad experiences with commercial fan speed controllers in the PCs in my home, I decided it would be easy to build a better one myself. Indeed, after a few evenings, I obtained these results....

* Three temperature sensors are supported, each controlling the speed of a (group of) fan(s).
* A small potmeter for each sensor allows to choose the actual temperature above which the fan starts running. Higher temperatures cause a linear increase in fan speed.
* When the measured temperature decreases, the actual fan speed is decreased only very slowly (taking several minutes), to avoid control instability.
* An additional potmeter provides a minimum fan speed, independent of temperature.
* The circuit is built with very few components, thanks to a low-cost PIC 16F676 microcontroller. This controller takes care of A/D conversion of the analog inputs, proper signal filtering, and the creation of PWM output signals to drive the fans. The PWM driving of the fans is a fast on/off switching with variable duty cycle, so the output transistors will remain cool even when driving many fans.
* A bicolor LED gives a visual temperature indication by gradually changing color from green to red."

http://jos.vaneijndhoven.net/fancntl/index.html

You also?

ArchibaldTuttle made a new topic and posted the link yesterday
Here is his thread http://www.lumenlab.com/forums/index.php?showtopic=11263.

With best regards,
TJ

People have applied that same statement to a whole projector! (Well . . . with at least one zero added to the 20 and 40.)

Oops - I should have known people on this forum would also keep up with Hackaday . Great site - just bad for my ego because 90 percent of the cool things are way beyound my capabilities.

well you did build the projector, I'm assuming. I got my projector build and screen build put up on hackaday! check out there home entertainment section!