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is there a way to transform a 3x AAA cell powered device into usb? Answered

Is there a way to power up a device that uses 3 AAA batteries into a hybrid usb and/or cell powered device?

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seandogue (author)2009-08-21

Sure. 3x AAA cells is 4.5VDC fully charged. That's so close to 5V (USB's supply voltgae) that in may circumstances, the conversion simply means adding a usb receptacle and using the correct pins

(1(5V) and 4(GND) btw)

However, if the device being powered is more sensitive to supply voltage, then you will have to power it using a 4.5V regulator

USB----REGULATOR----DEVICE

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