how to make low voltage high current transformer?

To make a low voltage high current transformer, start by selecting a suitable core material, such as ferrite or laminated silicon steel, to minimize losses. Wind the primary coil with fewer turns of thick wire to handle high current, and the secondary coil with more turns of thinner wire for voltage transformation. Ensure proper insulation between windings and use a suitable cooling method to manage heat. Finally, design the transformer to meet safety standards and efficiency requirements.