LM7905 5V Negative Voltage Regulator IC

Most voltage regulators in a typical project are positive, like the ubiquitous 7805, but some circuits, particularly op-amp and audio amplifier designs built around a split positive-and-negative supply, specifically need a regulated negative rail as well. The LM7905 fills that role as the negative-voltage mirror of the 7805, wiring up with the same simple three-terminal pattern but producing a steady -5V output instead. It is the part to reach for whenever a dual-supply analog design, such as a TL072-based audio circuit wanting both +5V and -5V rails, needs its negative side regulated just as cleanly as its positive side.