finally got my fan working no more overheating
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is there any way to control usb port voltage?? to control fan speed ??
I don't think there is.
Moreover you are providing 5V to a 12V fan, so it will be rotating much slower than it is meant to. Which can be good as it won't produce too much noise on one hand, but on the other hand it may fail to do a cold start.
You could use a 5V fan and add a rheostat to adjust the rotating speed and the noise.
Or you could power the fan from the DC input.
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Could feed it with 7v by hooking it up to 5v and 12v.
Aka the old noisy PC fan hack.
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