Compare the plug shapes, voltage and frequency in Antigua and Barbuda and Bulgaria, and find out which adapter you need before you travel.
Adapter required
Yes — coming from Antigua and Barbuda, you will need a travel adapter for Bulgaria. Antigua and Barbuda uses Type A/Type B plugs, and Bulgaria uses Type C/Type F, so the pin shapes will not fit any wall socket. The mains frequency is also different (60 Hz vs 50 Hz). This rarely matters for electronics but can affect motor-driven devices like clocks and shavers.
Antigua and Barbuda (home)
Bulgaria (destination)
Electrical specifications in Bulgaria
More about plugs in Bulgaria
In Bulgaria, the standard power plug is Type C and Type F. The country runs on 230 volts at 50 Hz. That means wall sockets in Bulgaria can be one of 2 different shapes — Type C, Type F, and your plug needs to physically match the socket to fit.
Full Bulgaria plug guide