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Automatic Switching for Battery

Switching between battery and USB using diode OR logic
Now since my college has frequent power cuts, I designed a basic switch to automatically switch between a portable mobile battery and the USB power using a diode OR gate. The circuit has been taken from here and looks like this: simulate this circuit – Schematic created using CircuitLab.
usb device - switch between battery and usb power no
That way I could switch between 4AA batteries (1*4 or 1*4) and USB power. The battery voltage would nicely be regulated to 5V too. And the idea was to use the shutdown pin of the chip IF USB power is detected. The device also has to work when no batteries are present.
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