Sinclair ZX Spectrum Power Supply Polarity – A Complete Guide


What is the ZX Spectrum power supply voltage? The psu voltage of a ZX Spectrum varies depending of which model it is you have. The output voltage from the ZX Spectrum 16K, 48K 128K psu is 9VDC. The output voltages from the ZX Spectrum +2A and +3 are -12VDC +12VDC and +5VDC.

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ZX Spectrum Power Supply Specifications

ZX Spectrum 16K / 48K / +

  • Input: 240V AC, 50Hz
  • Output: 9V DC, 1.4A
  • Centre Polarity: -ve (inner diameter is 2.5mm)

ZX Spectrum 128K:

  • Input: 240V AC, 50Hz
  • Output: 9V DC, 1.85A
  • Centre Polarity: -ve

ZX Spectrum +2:

  • Input: 240V AC, 50Hz
  • Output: 9V DC, 2.1A
  • Centre Polarity: -ve

ZX Spectrum +2A:

  • Input: 240V AC, 50Hz
  • Output: 5V DC 2A +12V DC 700mA -12VDC at 50mA.
  • 5 Pin Din Plug

ZX Spectrum +3:

  • Input: 240V AC, 50Hz
  • Output: 5V DC 2A +12V DC 700mA -12VDC at 50mA.
  • 5 Pin Din Plug

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