Reduce Fan Speed With Resistor

3 pin male to female resistance.

Reduce fan speed with resistor.

Use the 3 pin cable to connect the power supply to your cooling fan it will reduce the speed of the fan and cut the noise output dramatically. Quite practical and useful. Among all circuits i have make this is the simplest one. Designed with a resistor on the cable.

Emmawatsun sep 20 2018 6 48 am in response to rayjai you should put a big size resistor on the 5 volt side. In our psc example we would likely have had to slow the fan speed by 7 15 to give us the ability to get much closer to our target of 350 cfm ton. However the motor will draw more current when starting up and as the load increases causing higher voltage drop and reducing speed even more. This highlights one potential pitfall of this method you can t safely use 1 4w resistors for this unless you make up the target resistance using several smaller resistors of equal value in series.

Designed with a resistor on the cable. So to achieve a voltage drop of 5v we would need a resistor with value of 42 ohms and capable of dissipating 0 6w of power. I have a 5v usb fan and i want to reduce the speed. 3 pin male to female.

If the motor draws constant current then the resistor will drop a constant voltage and the motor will run at a fixed lower speed. Use the 3 pin cable to connect the power supply to your cooling fan it will reduce the speed of the fan and cut the noise output dramatically. Ecm motors typically offer all the same speed adjustments as psc s with the added ability to reduce speed in smaller increments from the low medium low medium high and high settings. The resistor will cause a voltage drop across its leads.

It uses a resistor to generate voltage drop and thus reduce the speed of a dc motor like the pc fan.