Question Is this schematic the correct way to adjust the speed of a 4 wire CPU fan? If not, would you please edit the schematic?

what are you trying to achieve with this fan?

if you only want to control the speed of a basic 4-wire Pulse Width Modulation(PWM) fan,
just plug it into a 4-pin PWM header on your motherboard
and set a custom fan speed curve either in your BIOS or your motherboard control software.

or are you looking to modify this fan for some other non-basic customized use?
 

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