Portable Calibrator: Stable 10V Reference

A stable voltage source is needed in many calibration process. Most electronic devices are affected by its surrounding temperature. To control all the components temperature by manipulating the surrounding temperature is not easy, but fortunately we can control only the most critical component to produce a stable voltage. The most critical component in a voltage reference is the reference diode, since it is the main reference for the voltage. With LM199 temperature stabilized Zener diode from Texas Instruments, the voltage source at non-inverting input of LM112 op-amp will be very stable (guaranteed 0.0001% per °C). Here is the schematic diagram of the circuit: