In many applications it is desirable for the output of anamplifier to swing close to its power supply rails. Mostamplifiers only guarantee an output swing of ±10V to ±12Vwhen operating on standard ±15V power supplies. With theaddition of four resistors and a pair of garden-variety transistors,the INA105 or INA106 difference amplifiers can bemodified to provide nearly a full ±15V output swing on±15V supplies.