The Sun’s core is a nuclear fusion engine, but it runs at millions of degrees and needs a huge containment system. We can’t put that on a board, so the real win is in how we handle the energy we do have. Keep your power supplies short‑circuit‑free, label every pin, and use a high‑efficiency switching regulator—ideally a resonant converter—so the losses stay low. If you ever see a prototype that actually works with fusion‑grade energy, double‑check the grounding, put a meter on every node, and label the test points. For now, stick to the tried‑and‑true DC‑DC tricks and you’ll still get ultra‑efficient power.