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Add USB Charging to a Hakko Cordless Soldering Iron

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A new guide on the Adafruit Learning System:

This project takes an existing tool — the Hakko FX-901 cordless soldering iron — and adds USB charging and a Lithium Ion battery inside a 3D-printed pack.
The FX-901 normally uses four AA cells, either alkaline or NiMH type. I like having this little iron around for cosplay electronics emergencies, and adding USB charging means there’s less to pack…it can use the same phone charger and USB cable I’m already traveling with. Less is good.
A fine little backup iron for anyone who does electronics outdoors…RC helicopters, ham radio, Burning Man, things like that.

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