how to make usb-powered AA battery charger?

i want to make a AA battery charger powered by usb

sort by: active | newest | oldest
On the end marked "current limited output"

DELETED_messam (author)  steveastrouk6 years ago
and the negative?
The negative connection comes straight from the USB port to the battery.

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

DELETED_messam (author)  steveastrouk6 years ago
i didn't mean to hack and make!
i want a "DIY" USB battery charger
How does this

not meet your stated requirements ?

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
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.

LED driver.JPG
DELETED_messam (author)  steveastrouk6 years ago
where do i put the battery?