Brandon Li posted a series of transistor animations on his website semisim.net. The animations display charge carrier motion using blue dots for electrons and red dots for holes, with white flashes indicating recombination events. Three configurations are shown: a basic model where carrier velocity equals combined diffusion and drift currents divided by total charge, a diffusion‑included model, and a probe‑based model showing currents and voltages at each terminal. The animations are licensed under a Creative Commons Attribution 4.0 license.