2N3904 Transistor: Hogwarts’ Unyielding Wand for Circuits & Cosmic Spells
The Leaky Cauldron’s Hidden Tool On a drizzly afternoon in Diagon Alley, I ducked into Quality Wands & Oddments—a shop that sold more than just wands. Behind the display of Felix Felicis and Pensieves, the owner, Mr. Fizzlewick, held up a small, cylindrical device, no bigger than a Bertie Bott’s Every Flavor Bean. “That’s