This thing let you charge batteries by pedaling. I made it for friends willing to do a European tour by bike. They needed to be autonomous with their camera and flashlight, thus needed a system for charging AA and C batteries.
The circuit is made around a max713 IC. We can choose to charge 1, 2, 3 or 4 batteries at once. We can also choose 2 loading rates. The charge state is shown by 2 LEDs. The schematics are below :
Be merciful, I made this circuit in my early days in electronics ! By the way, this is one of the first home-made PCB I’ve done.
I haven’t the source any more, only the picture below. I can’t even remember which software I used.
Stop it ! You are not allowed to laugh on that trail that goes around ! This circuit worked well, and has been useful.