Is it normal for a 4 pin fan splitter to have 1 4 pin input and x 3 pin inputs? Does that still work with PWM? - Quora
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Quick Hack: Converting a computer fan from thermostatic to PWM control | Rip It Apart - Jason's electronics blog-thingy
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circuit design - 4-wire fan controlled by potentiometer and 555 IC not behaving properly - Electrical Engineering Stack Exchange
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