My attempt to built a 5V USB Charger (used for Mobile Phone charger).
I have some batteries from old laptop battery. They are still can hold 3.7 V each
and the only problem is that the capacity is reduced from its original design.
So, this simple circuit below can make use of them. Two 3.7V batteries will sufficient to be used as source.
The charger is typical 9V DC adaptor (say 500mA).
Schematics : PowerPack-2575.sch
PCB Layout : PowerPack-2575.brd
Top view from finished PowerPack.
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