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what about converting existing devices from USB-A to USB-C? I have a bunch of powerbanks lying around that I'd love to keep using but most of my devices now use a USB-C charging cable, would it be a simple case of replacing the ports and re-soldering or is there any extra component I need to add?

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I would use an adapter for that use case.

The wiring of the ports on a new design is straightforward; you are using the same pins if it's USB 2.0 (As the article says), plus two extra connections that go to a resistors. If you can find ports that use the same footprint, feasible, but probably not worth it. Desoldering a port is a pain because you have to get all the pins to melting temperature concurrently, and you'd have to figure out how to wire those CC pins.

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