Group: Members
Posts: 2061
Joined: 7-January 03
Member No.: 17012
Xbox Version: none
360 version: none
I believe the fan runs at 12 volts whatever speed you set it. The Xbox uses Pulse Width Modulation (PWM) to rapidly switch it on and off.
CODE
Voltage waveform @ 0% duty cycle (fan speed) 12V 0V____________________
Voltage @ 20%:- 12V__ __ 0V ________ ________
Voltage on 40%:- 12V____ ____ 0V ______ ______
Voltage on 60%:- 12V______ ______ 0V ____ ____
Voltage on 80%:- 12V________ ________ 0V __ __
Voltage on 100%:- 12V____________________ 0V
The higher the speed setting though, the shorter the lifespan of the fan (if it's designed to run for 1 billion revolutions, then if you run it twice as fast it'll only run half as long).