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Can anyone point me to a good tutorial on how to do these?
I've made a few but don't think I ever used a tutorial.
It's fairly simple really. Female connector from motherboard/fan controller to a male connector with some wire in the middle.
Splits can be at the connector (hard) or mid section (easy).
The most complicated fan assembly I made was this one...
It takes PWM from graphics card, pipes it off to two fan connectors which get their power from motherboard and have their own tach feedbacks. I used it to drive a 140mm PWM fan on my old HD6950 and also a rear 120mm PWM Akasa Apache for a while. I didn't have any 4 pin PWM conectors so cobbled together 4 pin connectors out of a 3pin and a single 2.54mm pitch header.
This was done way before orange stuff became popular.