Varying voltage

[Petr Kocour]

Hi,
I know it may be a stupid question, but I'd like to vary voltage between 5 and 12 V using a potentiometer to control my PC fans. The PSU has 12 and 5 V cables. I was thinking about using the pot as voltage devider , but instead of connecting one lead to ground and the other one to 5V ,connecting one to 5V and the other one to 12V. Would that work? Thanks in advance

 

[Alec_t]

Welcome to EP!
Your PC fans are probably already controlled by the PC, using a PWM technique rather than simply varying the fan voltage, so you would need to avoid interfering with that.
How exactly do you plan to use the potentiometer to control speed?

 

[Petr Kocour]

Welcome to EP!
Your PC fans are probably already controlled by the PC, using a PWM technique rather than simply varying the fan voltage, so you would need to avoid interfering with that.
How exactly do you plan to use the potentiometer to control speed?

The fans are simple DC motors with two wires coming from them.

 

[Externet]

Just get one of these :

----> https://www.aliexpress.com/item/SXD...7cbb6de&transAbTest=ae803_5&priceBeautifyAB=0

 

[Cannonball]

Install a reastat in the positive lead going to the fan.

 

[CTP4500]

Doesn't it automatically adjust? pc fans. Just like the voltage regulators in a car alternator.

 

[kellys_eye]

Install a reastat in the positive lead going to the fan.

No.

Doesn't it automatically adjust? pc fans. Just like the voltage regulators in a car alternator.

No.

Just get one of these :

----> https://www.aliexpress.com/item/SXD...7cbb6de&transAbTest=ae803_5&priceBeautifyAB=0

Yes.

If you're going to do it, do it right.