This is a project that I created for my dad to exercise his soldering skills. He wanted to create a piece of electronics to extract the residual energy from old batteries for recharging batteries.
Thanks to the generous sponsorship from PCBWay, whose excellent PCB quality fuels my eagerness to incorporate their services into my upcoming projects. Stay tuned for updates on https://hackaday.io/project/192770-vstipiano and https://hackaday.io/project/160858-vstibox