Whats the best way of reducing the voltage to fan without using a rheostat . I know about the 7volt thing , but iam just wondering fi there is any better ways . Thx for nay help
Reostats use variable resistors in some form, you can of course just used fixed value resistors to reduce the voltage to a certain level, or swap the wires round to give a constant 5volts, not 12
Your choices are, (a) Resistive (either fixed or variable eg rheostat) (b) Diode junctions - waste 0.75v per diode (c) Linear regulation - a partly-on transistor wastes some volts (d) Pulse-Width-Modulation - switch the supply on & off so fast the fan can't catch its breath (e) Switched-mode power supply - DC-DC conversion, a sledge-hammer to crack a nut perhaps <pimp> Some circuits at Fan Noise Solutions and in several Bit-Tech articles. </pimp>
I understand a and b choices , but the other 3 iam not sure about . Thought after reading ur website iam going for choice b . Thx for the help sj
