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Vcc is usually used to lable power supplies for bipolar devices, that is Vcc is usually tied to Collectors of BJT transistors and the like. Vss and Vdd are the names given to power supplies or voltages related to Field Effect Transistors and related devices. That is, Vss is usually tied to Sources and Vdd is usually tied to Drains. <p>Its just a lable, used to make schematics a bit easier to read.
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