|
Ken, a series resistor is too lossy to efficiently run a fan. Granted it is the easiest most straight forward way. Wait and see what you need to get the dew heaters working well first. At 15v, you are really a bit too low to efficiently use a Zener reference for the 12v fan,(in theory it will work) but certainly, if you have to go as high as 18V on the heater, a zenner reference diode circuit would not be beyond your ability to construct (2 components)
|