Voltage Label Designators

In our Resistors Basics section, we covered a split power supply that gives us positive, ground and negative. Circuits that feature positive and negative may contain some odd schematic reference terminology to indicate the polarity.

The abbreviations are inherited from other areas of electronics, namely in use with BJT and FET transistors, and we will explain this at a later stage when we discuss transistors. V refers to Voltage, with the label in subscript indicating what type of voltage we’re getting. To summarise and remove the confusion, here’s a quick reference table, with the most common labels added:

Common Voltage Label Designators VDD VSS VCC GND

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