This configuration with the LM111 was found in your factory manual. The circuit can be implemented with modern operational equivalents. The power supply must be symmetrical.
This very low voltage regulator for 3 V input (2 batteries) was obtained in a documentation from...
This circuit consists of an adapter that allows the reading of low currents at various scales. A...
This circuit generates signals that can be adjusted in a small range around the frequency of the...