USB charger circuit >>

This is a conveyable battery steam-powered USB charger circuit. This circuit is ready to charge your PDAs, Ipods, Mp3 players and any device that insert to a laptop USB to charge. If you work this circuit in an exceedingly little box with a 9V battery then it'll become a conveyable emergency USB charger.
The schematic is therefore easy victimisation solely few parts therefore you'll be able to build this circuit in some minutes if all elements out there with you. The circuit is victimisation low dropout regulator IC LM7805 that is well out there within the market and it's additionally rock bottom. The circuit takes voltage from 9V battery and step down the voltage in to a DC 5V output 

 

Electronics Circuit Application