AA to USB charger

Can someone provide me with a schematic for a AA-5v USB charger, either using 2xAA or 4xAA, using parts available on ebay UK (and no programmable chips), much like the mintyBoost, but the chip isn't available in the UK.

a_pyles6 years ago
I've used a product from bodhi labs to build a USB charger if you don't mind a bit of soldering.

This will set you back about 10 US dollars. Not sure about the UK shipping though.
andy70707 (author) 6 years ago
Yes, I relise this, but that's not what I asked. I want to know how I can make a cheap homemade AA powered USB charger using 2, 3, or 4 AAs (I would have though 4 would be easiest as it will give most current and you can just use a voltage regulator.
lemonie6 years ago

"chip isn't available"
They ship internationally.