This large-scale Demonstration Transformer is designed for classroom instruction on electromagnetic induction and transformer principles. The coils are fitted with intermediary outputs that provide many transformation ratios, allowing for a wide range of demonstrations. The unit consists of a magnetic circuit made from highly permeable U-shaped metal sheeting, closed by two clamps with tightening screws. The cross-section measures 40 x 40mm, with a length of 150mm and height of 170mm. It includes a 6000-turn coil (I max: 0.2A, with a 2000-turn intermediary output), a 600-turn coil (I max: 2.5A, used as the transformer primary with a power supply cable), a 1200-turn coil (I max: 1.25A, with 400-turn and 800-turn intermediary outputs), and a 72-turn coil (I max: 12A, with intermediary outputs at 6, 30, 54, and 66 turns).