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I’m glad you’ve managed to run the circuit. Double check your wiring according soriak post (special Attention for power supply and ground connection!).
You can limit your fan speed two ways to avoid noise:
-Adjust power supply voltage of your fans. Use regulated power supply 5-12V and adjust to the voltage that meet your requirements.
-Software limit from vvvv side. Just limit your control values. Narrow range from 0…255, to 0…128 for example (theoretically run half of your fan maximum speed).
BTW I remembered a strange behavior in my setup with maximum pwm value of 255. Led strip connected starts flickering. So i just limit my range to 0…254, which meet my needs, without diving deep in firmata communication.