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how to make usb-powered AA battery charger? Answered

i want to make a AA battery charger powered by usb

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user
steveastroukBest Answer (author)2011-07-06

On the end marked "current limited output"

Steve

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user

The negative connection comes straight from the USB port to the battery.

Steve

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user
steveastrouk (author)2011-07-05

Take a look at the "related" links on the right of the page.

Steve

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user

i didn't mean to hack and make!
i want a "DIY" USB battery charger

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user

How does this
https://www.instructables.com/id/Simple-USB-Altoids-AA-Charger/

not meet your stated requirements ?

Steve

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top.boy (author)steveastrouk2011-07-06

sorry there is an error in facebook connecting , i'm messam the author

the only thing is that he made it with ready battery charger
i want to make it alone

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steveastrouk (author)top.boy2011-07-06

If you're charging Nimh batteries, then a simple constant current charger will work fine. Here's a circuit based on an LM317 you can easily adapt for the maximum charging current - I'd aim for no more than 50mA, to protect the batteries from overheating when they are fully charged.

Steve

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user

where do i put the battery?

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