Hi, I am controlling a 12V little fan BY PWM in a nano, with this HW configuration: [imagen] The PWM signal is generated by pin D6, and I managed the PWM frecuency from 1024 prescaler to 1. In all frecuency values I can listen a noise, depending the frecuency the noise is like a whistle (1khz an…

Hi, That is a BLDC fan, and some do not like a PWM power supply, or even a variable supply. They are designed for continuous speed and supply. Google; How does a BLDC fan work? To properly control one of these fans you need a four wire fan, the wires are; Power pair (2) Tacho output (1) Sp…

DC12V fan controlled by PWM => Noise

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DC12V fan controlled by PWM => Noise

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