Currently I have 10 fans inside my gaming pc. 2 are OEM fans that plug directly into the motherboard into separate 4pin (PWM) fan headers. The other 8 fans I have added myself. To power the extra fans I purchased a PWM motor controller (picture 1), and wired the input terminals to an extra power connector coming from the PSU (12v). This setup has been working great for months. Based on CPU temp the computer controls (the 2 fans) fan speed via PWM. So, for the other 8 fans, instead of having to turn a knob (POT wired to controller) I would prefer to somehow tap into the OEM PWM circuit (to allow the computer to control all fans based on CPU temp). I understand that I cannot simply tap into the OEM fan wires, due to the amount of current being drawn by the other 8 fans will overload the circuit. So is there a circuit/module similar to the one I purchased that uses an input wire to reference and existing PWM signal instead of a POT? Basically to copy the PWM but using power being supplied directly from the PSU.
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