Can someone help me with a variable voltage regulator please?

[boscoe]

Basically I want a regulator for the fans in my computer. I will be using the 12V source from the PSU and I would like a regular rotary means of controlling the speed as in a pot. I would like the voltagwe to be variable between 12V and 6V at 50W. I have a very good understanding of basic electronics and have the facilities to make PCBs. Can someone give me a circuit diagram for this please and give me an idea of the components I will need. Thanks
Boscoe.

 

[ericgibbs]

Basically I want a regulator for the fans in my computer. I will be using the 12V source from the PSU and I would like a regular rotary means of controlling the speed as in a pot. I would like the voltagwe to be variable between 12V and 6V at 50W. I have a very good understanding of basic electronics and have the facilities to make PCBs. Can someone give me a circuit diagram for this please and give me an idea of the components I will need. Thanks
Boscoe.

hi
Look here: https://www.electro-tech-online.com/threads/help-with-fan-control.105760/

Also Search the Forums for PC fan lots of posts.