Control the speed of your PWM fan easily. No need for other circuits.
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You might also need a transistor circuit (Specifically the base controlled by pin 9) depending on the fan's expected voltage level for PWM control.
Absolutely! The fans will be controlled together becuase of the shared PWM bus. I have been asked numerous times to make a version that can independently control 2 fans but unfortunately for stability reasons, I have not posted it.
First, sorry for the late reply. Secondly, make sure grounds are all connected together, thirdly, I wouldn't use the cap but should still work. The ground of the power supply should be connected to a ground pin on the arduino with pin 9 being solely connected to the PWM pin of the noctua fan. Please provide me with the part number if you still want to do this. We can also email for quicker responses.
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