If your looking for a neat DIY project this weekend then this DIY 9V Battery USB charger could be a fun gadgets to create, with only using a few components including a 9V battery, female USB port from an old PC and a small 5v regulator.
With some simple soldering viola you have a purpose built tiny portable USB charger for when you on the move which can be instantly recharged with an easily available new 9v battery.
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Via Unplugged
this circuit output voltage 4.80 v only. so mobile not chargering...
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