Pro-Ject turntables have two types of power supplies, depending on the model of turntable you have. 

You can determine which model you require by looking at the power connector on the back of your turntable. You will find a marking to determine if you require a 16V AC or 15V DC adapter.

PLEASE NOTE: These adapters are not interchangeable. By using the incorrect adapter, you are likely to cause a major fault with the motor of your turntable.

Below you will find examples of markings on your Pro-Ject turntable:

15V DC 

Buy a replacement here

16V AC 

Buy a replacement here