Michael Daly
New Member
I want to control the speed of a pair of 12V computer fans in parallel. I put together a circuit based on **broken link removed**. It works, however, all the variation occurs in the first third of the potentiometer's rotation. After that, the fans are at full speed for the remaining two thirds of the pot's rotation. I've experimented with a few other fans and different pot ranges ( 10k, 25k and 100k, definitely linear and not log). I even dropped the voltage by about 20% to see if that made a difference.
What can I do to get a wider range of adjustment (IOW, less sensitivity to the pot position in the beginning of the range). I don't know much about analog circuits.
What can I do to get a wider range of adjustment (IOW, less sensitivity to the pot position in the beginning of the range). I don't know much about analog circuits.