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Raspberry Pi GPIO Pinout: What Each Pin Does on Pi 4, Earlier Models | Tom's Hardware
Raspberry Pi 4 aktiven Lüfter steuern
Raspberry Pi 4 Lüfter anschließen und steuern - Tutorial
cooling - Is it safe to connect a 3.3v fan to gpio instead of power? - Raspberry Pi Stack Exchange
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The Raspberry Pi 4 needs a fan, here's why and how you can add one | Jeff Geerling
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Control 12v Fan with separate PWM Pin, Doing it right? (Will it Kill it?)) - Raspberry Pi Forums
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