Za niskie napiecie w PC

Witam Chcialem sobie podlaczyc pewne urzadzonko pod port typu PS/2 czy USB w PC. Ale mam problem .Mierze napiecie na zasilaniu = 4,96 V. Mierzez na tych portach i mam cos kolo 4,4 V. Czemu ??

Fantom

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Fantom
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