Pwm Fan Schematic. Some would argue that this is not the most. Following is the connector pin out and wire color code of a typical 4 wire fan.
For 4 wire pulse width modulation pwm controlled fans the pwm signal from the motherboard sources 5v during the on state of the pulse otherwise it s pulled to ground. The expectation is a 4 wire pwm controlled fan when properly implemented will be significantly quieter than a similar 3 wire fan. The tacho signal from the fan sinks to ground for every revolution the input on the motherboard is pulled high.
Following is the connector pin out and wire color code of a typical 4 wire fan.
Dc fan speed regulator circuit dc fan motor speed controller regulator circuit works on principle of pulse width modulation pwm technique by using this technique controlling of dc motor speed is very smoothly and noise free. Following is the connector pin out and wire color code of a typical 4 wire fan. The introduction of 4 wire pwm controlled fans is a means to reduce the overall system acoustics. The tacho signal from the fan sinks to ground for every revolution the input on the motherboard is pulled high.
