how to make small high voltage transformer?

To make a small high voltage transformer, start by selecting a suitable core material, such as ferrite or laminated steel, to minimize losses. Wind primary and secondary coils using insulated copper wire, ensuring the secondary has significantly more turns than the primary to achieve high voltage. Use a high-frequency AC source to drive the primary coil, as this increases efficiency. Finally, insulate the transformer properly to handle the high voltage safely. Always prioritize safety during construction and testing.