I plugged in a electric shaver on a 220v ?

Question

& it stop working .How can I fix it back? Is there a circuit I need to buy to replace it? if so what is it?

Answer 1

Buy a new one. It's not worth the time or cost of repair.

Answer 2

If it was a simple blade that vibrates back and forth due to a coil of wire, chances are the coil needs to be rewound / replaced.

If it uses rotary blades, there's a small motor inside - replace the motor.

If it is rechargeable, the charging circuit probably cooked.  Replace any visibly cooked component, or replace the whole charging module.

In any event:

1. unplug it,

2. disassemble,

3. replace anything that looks overheated, carbonized, or burnt.