12 Volt Fan Speed Controller

[Sunjumper]

Hello Forum, Re my recent post asking guidance for controlling the speed of a 12 volt fan. I found a basic circuit which I made a diagram of. See my uploaded image. The circuit consists of a IRFZ44N MOSFET and a 10K potentiometer. Firstly, will this work and secondly is this circuit considered to be PWM? Regards, Sunjumper.

 

[Minder]

NO. That is not PWM.
For a basic circuit look up many of the 555 versions to control the mosfet.
e.g. http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm

 

[Harald Kapp]

This type of power MOSFET is designed for switching operation. The circuit you show operates the MOSFET as a linear component. This can quickly destroy the MOSFET due to local overheating of the silicon structure.

 

[Sunjumper]

This type of power MOSFET is designed for switching operation. The circuit you show operates the MOSFET as a linear component. This can quickly destroy the MOSFET due to local overheating of the silicon structure.

Many thanks for your advice and guidance. It's very much appreciated. Sunjumper.

 

[Sunjumper]

NO. That is not PWM.
For a basic circuit look up many of the 555 versions to control the mosfet.
e.g. http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm

Thank you for your suggestion re using a 555 Timer for PWM fan speed control.
Very much appreciated. Sunjumper.