Brain Surgery I cracked open a cheap Halloween toy, found the super-simple LED + LR41 setup with the arm-as-switch trick, and swapped the ‘empty head’ for my own CH32V003 + buzzer PCB. Now it screams as well as shines—powered by a small lithium cell for extra volume because if you’re going to be annoying, do it properly. New schematic, new brains, same spooky vibes. 24 October 2025