> >Seriously, that's how I remember that Vdd is positive.

    You can just remember it, or understand it.

    Eletricity is "made" of electrons. These have negative charge. The real
"flow" of electricity is from negative to positive - the side who has more
electrons, give them for the side that has less electrons.

    Vdd means Voltage Drain, and Vss means Voltage Source

    Understanding the "real" (e.g.: Physical) flow of electricity, you
understand these terms in a moment! Voltage drain (positive) gets electrons
from the Voltage source (negative)

    Hope it helps ;o)


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