Comprises a W-shaped  laminated iron core mounted on base with a vertical bolt on its each side for clamping laminated 1-core or armature at its top. Also included are a set of three coils - one mains primary coil 240V AC, 50HZ, 2400 turns and two interchangeable secondary coils, 65 and 130 turns each giving outputs of about 6 volt and 12 volt approximately