PC 12V 3 pin fan slows down when trying to connect tacho signal | Electronics Forum (Circuits, Projects and Microcontrollers)
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mosfet - How can I adapt a 3-pin PC fan connector to a 4-pin connector? - Electrical Engineering Stack Exchange
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tachometer - 3-wire fan: Minimum supply voltage for Tach signal? - Electrical Engineering Stack Exchange
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arduino - how to read and control the speed of a 12V - four wire fan? - Electrical Engineering Stack Exchange
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arduino - how to read and control the speed of a 12V - four wire fan? - Electrical Engineering Stack Exchange
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sensor - 3 Wire Fan Tach, why using only one wire gives a signal? - Electrical Engineering Stack Exchange
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Reading RPM speed of 4Pin Fan from HP Blade Server - Motors, Mechanics, Power and CNC - Arduino Forum
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