USB Powered Mobile Charger Circuit
With the following mobile charger circuit, you can charge your cellphone from a USB outlet. Battery charger is pretty easy to be built because simple and does not involve many components as can be seen in the schematic.
Although it seems simple, but USB powered mobile charger circuit can provide a regulated voltage of 4.7V to charge the cellphone battery. Generally, a USB outlet can provide 5V DC and 100mA currents to slow the charging for mobile phone
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