MintyBoost

The MintyBoost is an open-source, small form-factor, USB charger which runs on AA batteries – and lets you charge your mobile phone, tablet or other USB device, without the need for mains power or a computer.  It was designed by one of the leading proponents of the open-source hardware movement, LadyAda – aka MIT Engineering graduate: Limor Fried

All the details of the circuit can be found on the project’s web-site.

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