I’m a big fan of my Sony DR-BT22 Bluetooth headphones. But Sony stupidly built the charger to run off 110v, so it’s not that portable. You have to find a plug to charge it up.
I thought there might be a place online to create a USB charger. The wall wart reads:
INPUT: AC120V/ca120V, 60Hz 5W
OUTPUT: DC3V/cc3V 1A
There’s also the diagram with a diamond with a (-) inside, a C (open side facing right, and a diamond with a (+) inside. The plug tip is very small.
Is this a possibility or more trouble than it’s worth?