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I have a Raspberry Pi Zero and I would like a tiny fan which draws 90 mA.

Obviously, I can't connect it to the GPIO pins and therefore I need to get 5 V from the input cable.

Before I start cutting the cable open, is there any pin that connects directly to the 5 V rail?

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There are two pins (2 and 4) on the gpio connector that carry the 5V supply voltage. See official schematics - look for J8 - or any of the gazillion websites showing Raspberry Pi pinouts.

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