I've got 2 PC fans (12V dc running from a 500mA rated supply). Thing is, whenever I try to use a pot to control their speed, the pot starts smoking.
This has just got to be possible, but everything I try just smokes the pot.
How can I control the fans with a 1/4 watt pot? do I use a transistor and use the tranny to control the base current, thereby avoiding the power dissipation issues?