Simple fan controller

Posted Apr 24th 2008 9:35PM by Will O'Brien
Filed under: misc hacks

When I built my LumenLab projector, I used a thermal switch to run the fan. This simple control circuit looks like a nice alternative. The circuit is a simple adjustable temperature triggered Fet. If you know the resistance needed, you can replace the potentiometer with a cheap resistor. (You'll want to use a DC fan)

Reader Comments

(Page 1)

1. I wonder, in the state that the fan doesn't spin where the voltage is too low for it to start rotating, will it slowly burn out?

Posted at 12:53AM on Apr 25th 2008 by MadEngineer

2. Nice - just what I need for my latest project: APRS temporary digipeater in a box. This is a better solution then a fan running constantly - even when it's not seeing any use. - Kris

Posted at 2:04PM on Apr 26th 2008 by Kris

3. I made a similar one a while back, still using it in one of my computers to regulate a fan: http://www.swisstech.net/util/lm317t/

Posted at 5:28PM on Apr 26th 2008 by patrick

Add your comments

Please keep your comments relevant to this blog entry: inappropriate or purely promotional comments may be removed. Email addresses are never displayed, but they are required to confirm your comments. To create a live link, simply type the URL (including http://) or email address and we will make it a live link for you. You can put up to 3 URLs in your comments. Line breaks and paragraphs are automatically converted — no need to use <p> or <br> tags.