Panasonic FS-AA51
This page was last modified 10:05, 27 November 2022 by Gdx. Based on work by Mars2000you and Rderooy.



The Panasonic FS-AA51 is an external power supply (PSU), that was supplied with the Japanese Panasonic FS-A1 and FS-A1mkII MSX computers.

The power supply has the same specifications, connector and pin-out as the Sony AC-HB3, and they are therefore compatible. A similar adapter (apart from input voltage), the Toshiba FS-AA52 was also included with the Toshiba FS-TM1, sold in Italy.

If the power supply is missing, it can be difficult to source a replacement, as it not only uses an unusual connector, but it also supplies two different voltages of which one is AC and the other DC.

While this adapter may seem similar to the Sony AC-HB1 series, or the Sony AC-HB2P, the connector and output voltages are NOT the same, and they cannot be used as substitutes


Panasonic FS-AA51
Panasonic FS-AA51 back
Panasonic FS-AA51 connector
Panasonic FS-AA51 detail


The connector is sometimes referred to as Mini-IEC.

The same connector was also used on the Neo Geo CD and on some old HP power supplies like the HP SDD018-1000. Do note however that the output voltages are NOT compatible.

  • Input: AC 100V ~ 50/60Hz 23VA
  • Output:
    • DC9V ⎓ 1.2A
    • AC18V ~ 170mA
Circuit Diagram of the Panasonic FS-AA51 AC Adapter

External links