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ELFORUM - Forumul electronistilor
pegas

alimentare negativa

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sa spunem ca am nevoie de o alimentare de -5V.de ce nu pot folosi o sursa de +5V, la care leg "+5V" la masa iar masa la "-5V"?diferenta de potential nu ar fi aceeasi?

ba da - diferenta de pontetial intre acele puncte este de -5 V dar daca masori intre ramura obtinuta de -5 V si cea initiala de 5 V - ai 0pe cand la un -5 V - masurat fata de cea de +5 V - ai 10 V
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Atata timp cat sursele au izolatie galvanica intre primar si secundar, merge. Insa majoritatea surselor comerciale au iesirea de masa legata la impamantare, iar in momentul in care tu legi plusul uneia din surse la masa celeilalte, vei face scurt prin impamantare./pisoiu

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