The noninvertiiig terminal of the op amp is grounded, and the circuit uses the voltage at the inverting t
erminal as a reference. Its voltage gain is determined by the R2/R ratio. When R2 is set at zero, the circuit has unity gain and a 0.55-V output. When R2 is set to the maximum value, the circuit has a gain of 50 and an output of about 25 V. The circuit provides good regulation and can supply output currents of several milliamps. The output voltage however, is not temperature compensated.