Li-Ion USB Powered Battery Charger Circuit
One of the most extensive and convenient ways to connect electronic devices to the computer is a Universal Serial Bus (USB). However, the use of a separate power supply is still a lot of battery-powered units encountered for charging batteries. With a maximum power rating 5.25V/500 mA, USB bus power is a great source to build a USB powered battery charger for a single-cell Lithium-Ion battery.
The circuit below shows how to build a USB powered
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