Hello, Whenever reading about op amps, I have come across two terms, 'dual supply' and 'single supply'. Whenever referring to dual supply, I have seen +/- next to the indicated value of the supply, such as +/- 5 volts. Though, whenever single supplies are discussed, there is no negative sign and simply a value such as +5 volts. This is a pretty basic question, but does the +/- refer to the fact that dual supply means AC and single supply means DC? And if so, would it mean an op amp that calls for a single supply should be powered at the supply terminals with DC, and dual supply op amps should be powered with AC?