Switching power supply for Sizif-512 board.
- Voltage: 9V
- Max. current: 1A
- Plug: 5.5mm / 2.1mm (center positive)
- Overvoltage and short-circuit protection
This power adapter is designed for Sizif-512 motherboards with an attached sound card. When connecting external expansion cards, you should account for them in the current budget. The Sizif-512 board itself draws 250mA, and with the attached sound card, it draws 500mA. It is protected by a 750mA polymer fuse.
Note!:
This power adapter is NOT intended for original ZX Spectrum computers (80s versions) and may cause damage to them. The reason is the reverse power polarity (center negative) and the high current draw of original ZX Spectrum computers.

![_original_Zasilacz-do-Sizif-512-9V-1A_[374]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_374_0c20274c9e34-600x450.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[375]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_375_0c20274c9e34-600x286.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[376]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_376_0c20274c9e34-600x235.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[377]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_377_0c20274c9e34-600x596.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[378]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_378_0c20274c9e34.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[374]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_374_0c20274c9e34-100x100.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[375]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_375_0c20274c9e34-100x100.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[376]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_376_0c20274c9e34-100x100.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[377]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_377_0c20274c9e34-100x100.jpg)
![_original_Zasilacz-do-Sizif-512-9V-1A_[378]_0c20274c9e34 Power adapter for Sizif-512 (9V, 1A, 5.5mm/2.1mm, center positive)](https://mumio.dev/wp-content/uploads/2026/01/original_Zasilacz-do-Sizif-512-9V-1A_378_0c20274c9e34-100x100.jpg)
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![_original_Zestaw-obudowy-CZARNY_[206]_0c20274c9e34 ZX Spectrum 48 Case - Complete Kit - BLACK](https://mumio.dev/wp-content/uploads/2026/01/original_Zestaw-obudowy-CZARNY_206_0c20274c9e34-300x300.jpg)
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