Lerneaen Hydra's Lair

One aspect common to most available consumer ‘MP3 Players’ is that they, while very thin and easy to fit in a pocket, use a non replacable Li-Ion battery. Additionally usually they’re only rechargable via USB! The previous music player I had used AA batteries and it was very nice to be able to swap them [...]

I’ve recently got a boombox in exchange for development of a Li-Ion charger (the same charger is inside the boombox).
The charger is a very simple one based on the L200 linear regulator and an Atmel Mega168 microcontroller. The L200 is configured to charge with a constant current/constant voltage scheme limited to 2A and 16.75V, the [...]