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If you have wall wart with stable DC 12V output, you can use DC-DC Step Down Converter to get also 5V from it. Something similar to this one from e-bay: https://www.ebay.com/itm/262539360829?hash=item3d2090ba3d:g:TTMAAOSwsTxXjvqq

Hi naboo, You can use any old PC PSU and the 'trick' in using it without motherboard is in making jumper connection from pin #14 (green wire, 'PS-good') to pin #15 (black wire 'Ground', 'COM') (if old 20-pin 'ATX1' motherboard connector) or pin #16 green wire to pin #17 black wire (newer, 20+4...