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.
Small variations in the resistance of the skin of a person holding the electrodes can be detected by...
The output stage of this amplifier can operate at high voltage. The transistor must be a high...
This 8.2 V voltage reference was found in a 1968 Electronic Design. The op amp is from the time,...