LM7912 12V Negative Voltage Regulator IC

Where the LM7905 covers negative-rail needs at 5V, the LM7912 does the same job at the higher 12V level that many op-amp and audio power amplifier designs are built around, since a lot of professional-style analog circuits run on ±12V rather than ±5V. Pairing it with a standard LM7812 positive regulator gives a project a complete, cleanly regulated split supply for driving op-amps or amplifier stages that need both polarities at that higher voltage, rather than settling for an unregulated negative rail straight off a center-tapped transformer or battery pair.