Self-made high-pressure mousetrap ~ I want to ask experts for help

It depends on how many volts the voltage is at a time. The voltage of each winding of the transformer is the same. It is best to find a chart with transformer data before making it.

Get an old TV high-voltage bag and distinguish the primary ones clearly, which can increase the voltage to tens of thousands of volts, killing rats and even people is more than enough. Be careful! You'd better not. Don't kill rats, kill people first.