how to make a simple high voltage transformer?

To make a simple high voltage transformer, start with a low voltage transformer as your base. Use a ferrite core or laminated iron core to minimize losses. Wind a primary coil with a few turns of thicker wire, and a secondary coil with many turns of thinner wire. Ensure the secondary coil is insulated properly to handle high voltage. Connect the primary to a low voltage AC source, and the transformer will step up the voltage on the secondary side. Always prioritize safety when working with high voltages.