This
is a portable battery powered USB charger circuit. This circuit is
able to charge your PDAs, Ipods, Mp3 players and any device that plug
in to a computer USB to charge. If you fit this circuit in a small box
with a 9V battery then it will become a portable emergency USB
charger.
Simple Portable battery Powered USB Charger Circuit Diagram
The schematic is so simple using only few components so you can make this circuit in some minutes if all parts available with you. The circuit is using low dropout regulator IC LM7805 which is easily available in the market and it is also very cheap. The circuit takes voltage from 9V battery and step down the voltage in to a DC 5V output.
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